Bush presided over the invasion of Panama and the Gulf War, ending the Iraqi occupation of Kuwait in the latter conflict. Though the agreement was not ratified until after he left office, Bush negotiated and signed the North American Free Trade Agreement (NAFTA), which created a trade bloc consisting of the United States, Canada, and Mexico. Domestically, Bush reneged on a 1988 campaign promise by signing a bill that increased taxes and helped reduce the federal budget deficit. His squadron was assigned to the USS San Jacinto as a member of Air Group 51, where his lanky physique earned him the nickname 'Skin'. Bush won re-election to the House unopposed, while Nixon defeated Hubert Humphrey in the presidential election. In 1970, with President Nixon's support, Bush gave up his seat in the House to run for the Senate against Yarborough. Bush easily won the Republican primary, but Yarborough was defeated by the more centrist Lloyd Bentsen in the Democratic primary. Ultimately, Bentsen defeated Bush, taking 53.5 percent of the vote.