Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellLawmakers feel pressure on guns Bipartisan group of House lawmakers urge action on Export-Import Bank nominees Curbelo Dem rival lashes out over immigration failure MORE (R-Ky.) on Sunday declined to support former Sen. Chuck HagelCharles (Chuck) Timothy HagelIntel chief: Federal debt poses 'dire threat' to national security Hagel: Trump is 'an embarrassment' Tax cut complete, hawks push for military increase 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 punts fight over Dreamers to March Pence tours Rio Grande between US and Mexico GOP looks for Plan B after failure of immigration measures MORE (R-S.C.) on Sunday calling the decision an "in your face nomination" from Obama.