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Independent Sen. Angus KingAngus Stanley KingOvernight Defense: Senate rejects border emergency in rebuke to Trump | Acting Pentagon chief grilled on wall funding | Warren confronts chief over war fund budget Shanahan grilled on Pentagon's border wall funding Senators offer bipartisan bill to fix 'retail glitch' in GOP tax law MORE is backing his Maine colleague, Republican Sen. Susan CollinsSusan Margaret CollinsSenate GOP poised to go 'nuclear' on Trump picks Overnight Health Care: CDC pushes for expanding HIV testing, treatment | Dem group launches ads attacking Trump on Medicare, Medicaid cuts | Hospitals, insurers spar over surprise bills | O'Rourke under pressure from left on Medicare for all Dem group launches ads attacking Trump's 'hypocrisy on Medicare and Medicaid cuts' MORE, in her reelection bid. 

The Associated Press reports King, who caucuses with Democrats, will endorse the centrist Collins on Friday. 

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"I think she's one of the Senate's MVPs — smart, tough, and always willing to listen. In my book, she's a model senator and I'm delighted to support her re-election," King told the AP in a statement. 

King’s move could foreshadow his own political plans in the next Congress. The Hill reported earlier this year that King will decide after the midterm elections whether he’ll caucus with the GOP, and the senator hasn’t ruled out aligning himself with Republicans if they end up controlling the Senate. 

But his picks were bipartisan on Friday, too. He also backed Sen. Jeanne ShaheenCynthia (Jeanne) Jeanne ShaheenSenate Dems petition Saudi king to release dissidents, US citizen Senators offer bipartisan bill to fix 'retail glitch' in GOP tax law Overnight Energy: EPA moves to raise ethanol levels in gasoline | Dems look to counter White House climate council | Zinke cleared of allegations tied to special election MORE (D-N.H.) in her match against former Sen. Scott Brown (R-Mass.), a much tougher contest than Collins's but one where Shaheen is still favored. 

Collins is heavily favored in her bid for a fourth term against Democrat Shenna Bellows, former director of the state’s ACLU chapter. 

King and Collins are former political rivals, too. He beat her in a 1994 three-way race for governor. But now he has nothing but praise for his onetime opponent. 

"Since entering the Senate, I have had a chance to work with Susan Collins on a wide variety of issues. I've seen first-hand her work ethic, her intelligence and her integrity," he continued in a statement. "She always puts Maine and the country first and isn't afraid to cross party lines to get things done."

This post was updated at 1:53 p.m.