Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellDems think they're beating Trump in emergency declaration battle Sanders: 'Not crazy' about nixing the Senate filibuster McCabe: No one in 'Gang of Eight' objected to FBI probe into Trump MORE (R-Ky.) on Sunday declined to support former Sen. Chuck HagelCharles (Chuck) Timothy HagelFormer US Defense secretary: 'American global leadership now is really nowhere' Meet Trump’s pick to take over for Mattis at Pentagon Juan Williams: Trump is AWOL on our troops MORE for secretary of Defense and said Republicans would look closely at the likely nominee.

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Obama is expected to nominate Hagel soon to replace Leon Panetta at the Pentagon, reports Sunday said. Although former senators often get a break from their former colleagues during the nomination process, Hagel has already proven highly controversial, with some conservatives questioning his commitment to Israel.

“I’m going to wait and see how the hearings go, and whether Chuck’s views square” with the job, McConnell said on ABC’s “This Week with George Stephanopoulos.”

He said any nominee would need to have “a close understanding” of the U.S.’s relationship with Israel.

“Whoever that is will be given a thorough vetting,” McConnell vowed.

The Republican Senate leader had praised Hagel’s “clear voice” when Hagel retired from the Senate in 2008.

The selection is likely to spark a contentious nomination fight, with Sen. Lindsey GrahamLindsey Olin GrahamCongress closer to forcing Trump’s hand on Saudi support Democrats brush off GOP 'trolling' over Green New Deal Warren: Officials have duty ‘to invoke 25th amendment’ if they think Trump is unfit MORE (R-S.C.) on Sunday calling the decision an "in your face nomination" from Obama.