On April 7, 2017, Sanders showed disapproval of President Trump's ordered airstrike from the day before: "If there’s anything we should’ve learned from the wars in Iraq and Afghanistan, in which the lives of thousands of brave American men and women and hundreds of thousands of Iraqi and Afghan civilians have been lost and trillions of dollars spent, it’s that it’s easier to get into a war than out of one."
In May 2017, Sanders endorsed Labour Leader of the Opposition Jeremy Corbyn in the 2017 United Kingdom general election.
On June 11, 2017, Sanders was a keynote speaker at the People's Summit in Chicago, Illinois. In his speech, Sanders discussed of a plan that "can enhance and expand issue campaigns and hold all elected officials accountable to popular demands for justice, equality, and freedom". During his speech, he repeatedly criticized the Democratic Party, calling it an "absolute failure" and blaming it for the election of President Donald Trump and Vice President Mike Pence.
On June 12, 2017, United States senators reached an agreement on legislation to add new sanctions on Russia. The bill was opposed only by Sanders and Republican Rand Paul. On June 14, 2017, James T. Hodgkinson, a supporter of Sanders during his presidential campaign, shot and injured four people, including House Majority Whip Steve Scalise of Louisiana. Hours later, Sanders responded on Capitol Hill to news that Hodgkinson was a campaign volunteer for his 2016 presidential run:
I am sickened by this despicable act. Let me be as clear as I can be, violence of any kind is unacceptable in our society and I condemn this action in the strongest possible terms. Real change can only come about through nonviolent action, and anything else runs counter to our most deeply held American values.
In September 2017, Sanders introduced the United States National Health Care Act which would create a single-payer health care system paid by the United States Government. The plan, also known as "Medicare For All", was supported by former President Barack Obama in September 2018.
On October 12, 2017, Sanders was announced as a key speaker for a women's rights convention in Detroit, Michigan. However a week later, Sanders cancelled his appearance at the convention so that he could travel to Puerto Rico and help rescue efforts from the damage of Hurricane Maria.
In November 2017, after the Paradise Papers were leaked, Sanders warned of "an international oligarchy" and blamed corrupt billionaires and companies for trying to avoid paying taxes and called it unfair.
On January 1, 2018, Sanders sworn-in Bill de Blasio in his second mayoral inauguration as Mayor of New York City. On January 20, 2018, Sanders voted against a congress budget bill which led to the 2018 federal government shutdow, which lasted two days, ending on January 22. On his vote, Sanders said on Twitter:
Republicans control the House, Senate and White House. They have to pass an annual budget, not more one-month continuing resolutions. We need a bipartisan solution to the economic crises facing the middle class, to the DACA crisis that Trump created and to disaster relief.
Sanders gave an online reply to Trump's January 2018 State of the Union address in which he called Trump "dishonest" and criticized him for creating "a looming immigration crisis" by ending the Deferred Action for Childhood Arrivals program.
In March 2018, many students walked-out of their schools as a result of the Marjory Stoneman Douglas High School shooting in Parkland, Florida demanding for gun-control and safety in schools. Sanders joined the protest outside of the United States Capitol and praised the protesters for "leading the [United States] in the right direction" while criticizing the National Rifle Association.
Sanders was named as part of the "Hell-No Caucus" by "Politico" in April 2018, along with Senators Cory Booker, Kirsten Gillibrand, Elizabeth Warren, and Kamala Harris, all of whom voted to reject Trump's nominees for administration jobs, including Jeff Sessions, Kirstjen Nielsen, Rex Tillerson, Betsy DeVos, and Mike Pompeo.
On May 9, 2018, Sanders proposed the Workplace Democracy Act, a bill that would grow labor rights by making it easier for workers to join a union and make it harder to break-up unions. It was supported by several Democratic senators, including Elizabeth Warren, Kirsten Gillibrand, Tammy Baldwin and Sherrod Brown.
On August 14, 2018, Sanders won the Democratic nomination for Senator with 94% of the primary vote. However, before the primaries, Sanders said he would not accept the Democratic nomination and run as an Independent.
In August 2018, Sanders criticized the wealth of Amazon founder Jeff Bezos and how Amazon employees were paid less than the minimum wage and lived under poor conditions while Bezos increased his fortune. In September 2018, Sanders introduced the "Stop BEZOS" bill which would focus on increase work wages for Amazon and Walmart employers and heavily tax Bezos and other higher company officials. In October 2018, Bezos announced that the company would pay all employees in the United States minimum wage with many believing Sanders is the reason why.
In October 2018, Sanders introduced a bill to break up big banks such as JPMorgan Chase, Wells Fargo, Goldman Sachs and Bank of America. The bill would allow the federal government to dismantle banks that has a worth of 3% of the American GDP, which is roughly equal to USD $584 billion.
In November 2018, Sanders was re-elected to the Senate winning nearly 68% of the vote.
In September 2018, "The Guardian" published two op-ed pieces talking about the need of a progressive cooperation to challenge the rising threat of globalism and authoritarianism, one of which Sanders wrote and another by European progressive Yanis Varoufakis. In late October, Varoufakis announced the upcoming launch of Progressives International on November 30 in Vermont alongside Sanders. Former 2018 Brazilian presidential candidate Fernando Haddad joined the movement.
In December 2018, Sanders supported a bill with Senators Chris Murphy and Mike Lee to use the 1973 War Powers Resolution to end U.S. support for the Saudi-led military intervention in Yemen. At first, the Senate did not supported it, but after the assassination of Jamal Khashoggi in October 2018 the bill had bipartisan co-sponsors and the Senate passed the bill by a vote of 56–41 on December 13.
In March 2019, Sanders, along with seven other members of Congress such as Elizabeth Warren and Alexandria Ocasio-Cortez, signed a pledge written by veterans and their families to bring a "responsible" end to U.S. military interventions around the globe.
On February 5, 2020, Sanders voted to convict President Donald Trump in his impeachment trial.
In December 2020, Sanders alongside Republican Senator Josh Hawley of Missouri, pushed for a USD $1,200 check for every unemployed American who were affected by the COVID-19 pandemic in the United States.
When Democrats gained control of the Senate in the 2020 elections, Sanders became Chair of the U.S. Senate Budget Committee on January 20, 2021. He said he would make a COVID-19 relief bill with a $2,000 stimulus checks and raising the minimum wage to $15 an hour his main goal.
In August 2011, Public Policy Polling found that 67% of American people supported Sanders. That made him the third most popular senator in the country. In a poll by Fox News in March 2017, found Sanders to be the most popular senator or political figure in the United States with the approval rating of 61%.
A Harvard-Harris Poll published every April found Sanders to be the most popular active politician in the country. The same poll, finds Sanders to be the most popular senator in the country.
, Sanders's committee assignments are as follows: