Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellTrump 'no longer angry' at Romney because of Supreme Court stance On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline The Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power MORE (R-Ky.) on Sunday declined to support former Sen. Chuck HagelCharles (Chuck) Timothy HagelWhile 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 National security leaders, advocacy groups urge Congress to send election funds to states 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 GrahamSteele Dossier sub-source was subject of FBI counterintelligence probe Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Key Democrat opposes GOP Section 230 subpoena for Facebook, Twitter, Google MORE (R-S.C.) on Sunday calling the decision an "in your face nomination" from Obama.