Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellPush to expand Supreme Court faces Democratic buzzsaw Schumer labels McConnell's scheduled coronavirus stimulus vote as 'a stunt' Pelosi gives White House 48-hour deadline for coronavirus stimulus deal MORE (R-Ky.) on Sunday declined to support former Sen. Chuck HagelCharles (Chuck) Timothy HagelArmy taps University of Wisconsin to lead research into hybrid vehicles, aircraft While our foes deploy hypersonic weapons, Washington debates about funding Hillicon Valley: Democrats request counterintelligence briefing | New pressure for election funding | Republicans urge retaliation against Chinese hackers 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 GrahamPush to expand Supreme Court faces Democratic buzzsaw RNC chairwoman: Republicans should realize distancing themselves from Trump 'is hurting themselves in the long run' Latest Mnuchin-Pelosi call produces 'encouraging news on testing' for stimulus package MORE (R-S.C.) on Sunday calling the decision an "in your face nomination" from Obama.