Senate Minority Leader Mitch McConnellMitch McConnellTrump’s isolation grows Ellison: Trump has 'level of sympathy' for neo-Nazis, white supremacists Trump touts endorsement of second-place finisher in Alabama primary MORE (R-Ky.) on Sunday declined to support former Sen. Chuck HagelChuck HagelSpy agencies changed rules, making it easier to unmask members of Congress Pentagon withholding nuclear weapons inspection results: report Lobbying World 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 GrahamGraham: Trump's Charlottesville rhetoric 'dividing Americans, not healing them' OPINION: Congress should censure Trump for his unfit conduct Supporting 'Dreamers' is our civic and moral duty MORE (R-S.C.) on Sunday calling the decision an "in your face nomination" from Obama.