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Blackburn's entry followed a decision earlier in the day by  term-limited Gov. Bill Haslam  to sit out the race  despite entreaties from Corker  Senate Majority Leader Mitch McConnell of Kentucky and Tennessee's senior senator  Lamar Alexander.
"While I have loved being a mayor and a governor  I don't feel the same call to run for Senate at this point " said  Haslam .  He  said the hyper-partisanship that surrounds Congress was a factor in  his  decision.
 Haslam 's popularity in the state and  his  vast personal wealth would have made  him  a strong candidate  despite lingering anger among some Republicans over  his  call to Donald Trump to abandon  his  presidential nomination last year following the release of a videotape in which Trump boasted about groping women.
Corker  who announced last week that  he  wouldn't seek a third term  also publicly criticized the Republican president  for  his  response to a deadly white nationalist rally in Virginia. Corker questioned whether Trump had the "competence" or "stability" to succeed in office.
"I believe in President Trump's immigration ban  and I'll fight with  him  every step of the way to build that wall " she said. "I stand when the president walks in room  and yes  I stand when I hear the Star Spangled Banner."
Former U.S. Rep. Stephen Fincher is another potential Republican Senate candidate  and is expected to make a decision in the coming days.  Haslam  hasn't said whether  he 'll endorse a Republican in the race.
Blackburn joins Tennessee Senate race after Haslam begs off

Jay Sekulow  chief counsel of the American Center for Law and Justice  introduces Republican presidential candidate and former Florida governor Jeb Bush during a presidential candidate forum at Regent University in Virginia Beach  on Oct. 23  2015. (AP Photo/Steve Helber)
Jay Sekulow  a member of the legal team counseling Trump on special counsel Robert S. Mueller III's wide-ranging Russia probe  said Tuesday that a second special counsel should be appointed to focus on FBI and Justice Department investigators.
 Sekulow 's call for a second special counsel was first reported Tuesday morning by Axios.
 Sekulow  did not allege wrongdoing on the part of Mueller or  his  team  telling The Washington Post that  his  call for a second special counsel has ânothing to do with Bob Mueller.â
But  Sekulow  argued that alleged conflicts of interest among FBI and Justice Department officials demand a full investigation by a special counsel.  He  singled out a Fox News report last week that Bruce G. Ohr  a senior Justice Department official  was demoted amid an investigation of  his  contacts with Fusion GPS  the opposition research firm that commissioned a salacious dossier documenting Trump's ties to Russia.
âThis is the kind of situation that  in my view  warrants a special counsel â  Sekulow  said.
Asked whether he was speaking on Trump's behalf or whether the president agrees with having a second special counsel   Sekulow  would not answer.  He  said  he  does not speak publicly about  his  conversations with the president.
 Sekulow  works alongside John M. Dowd  another private attorney for the president  and in close collaboration with Ty Cobb  a White House lawyer who handles the Russia portfolio.
Trumpâs lawyer calls for a special counsel investigation of alleged corruption at FBI and Justice Department

Manny Pacquiao has made no secret of his political ambitions outside the ring but dabbling in government isn't the same as taking it on as a full-time career  says trainer Freddie Roach.
Roach said Pacquiao my run for office in his native Philippines  but after the fighter gets a taste of political life Roach expects him to eventually return to his boxing roots.
"I would love to see him go out on top " Roach said. "The thing is he can fight for a long time  because his work ethic is so great.
"Once he gets into politics and finds out how corrupt it is he will come back to boxing. He can do more as a boxer than a politician for his countrymen. Although he's proven me wrong before."
The first round of the fight will be dangerous for both fighters and Roach said their plan is to hit Cotto with some big shots from the opening bell.
"I don't have to tell him the game plan anymore " Roach said. "It is automatic now. I make moves in training like Cotto makes in the fight. It is like a dance. He knows exactly what to do in those situations.
Roach says they can shake Cotto's confidence by hitting him early.
"We are going to show our power in the first round and hit him to remind him of the punches he took in the (Antonio) Margarito fight.
"We are not going to go in and start swinging at him we are going to do it smart. We will walk Cotto into a fight because he follows and when he follows we will take advantage of that."
Roach said if the smaller Pacquiao doesn't have the power to knock Cotto out then he can wear him down with his superior hand speed and lightning quick feet.
"I honestly don't think we are going to knock him out " said Roach. "We are going to make him quit."
After watching hours of tape of Cotto in his most recent fights  Roach predicts he will do one of two things.
"He is going to use his strength and come forward and show us he is a bigger stronger guy or he is going to try to become a counterpuncher. But you can't become someone else in an eight-week period. We have a perfect game plan  I think."

Boxing: Filipino Pacquiao uses ring to get message across