Sen. Ted Cruz Rafael (Ted) Edward CruzLoeffler calls for hearing in wake of Netflix's 'Cuties' Health care in the crosshairs with new Trump Supreme Court list 'Parks and Rec' cast members hosting special reunion to raise money for Wisconsin Democrats MORE (R-Texas) on Friday threw his support behind former United Nations Ambassador John Bolton to replace Michael Flynn as President Trump's national security adviser.

"He's someone who understands the world. He understands the threats of radical Islamic terrorism," Cruz told CNN's Manu Raju. "He understands the threats of an over-aggressive [Russian President Vladimir] Putin."

"And at the same, I think he has demonstrated an understanding that we should be reluctant to use military force. That we should do so only when absolutely necessary."

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Bolton, a foreign policy hawk who served as President George W. Bush's ambassador to the U.N., has also been a rumored pick for deputy secretary of State.

Despite Cruz's approval, some Senate Republicans, such as Sen. Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (R-Ky.), have fiercely opposed Bolton's appointment to the Trump administration.

Further complicating an appointment, Bolton was a staunch supporter of the U.S. invasion of Iraq in 2003. Trump has criticized the war after initially supporting the invasion, calling into question whether their perspectives will align.

Flynn abruptly resigned on Monday amid revelations that he may have mislead Vice President Pence about a phone call Flynn had with the Russian ambassador.

The president offered the job to retired Vice Adm. Robert Harward after Flynn's resignation, but Harward turned down the offer.