Sen. Tim Scott to endorse Rubio

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South Carolina Sen. Tim ScottTim ScottGOP senators avoid Trump questions on rigged election More Senate Republicans pressure Treasury over debt-equity rules Trump's implosion might be blessing in disguise for GOP MORE (R) is expected to endorse Sen. Marco RubioMarco RubioJuan Williams: When WikiLeaks leaked my cell number 56 memorable moments from a wild presidential race New York Times endorses Rubio's rival MORE (R-Fla.) for president on Tuesday, according to a report from Politico.

Scott would be Rubio's second congressional endorsement from South Carolina. Rubio also has the support of Rep. Trey GowdyTrey GowdyLawmakers press Lynch for briefing on Yahoo secret email scanning reports Clinton IT aide pleads Fifth, skips hearing House Oversight subpoenas FBI for Clinton investigation documents MORE (R-S.C.), the chairman of the House committee investigating the 2012 Benghazi attacks.

Scott is the only black Republican in the U.S. Senate, and his endorsement could give Rubio a boost in the first Southern primary state.

Rubio has the support of 28 lawmakers, according to The Hill's tally of congressional endorsements. That's good for second place, behind former Gov. Jeb Bush (Fla.), with 31.

Lindsey GrahamLindsey Graham56 memorable moments from a wild presidential race High anxiety for GOP NYC mayor: Trump sounds like ‘a third-world dictator’ MORE, South Carolina's other senator who ended his own presidential bid in December, is backing Bush.

Updated at 9:47 p.m.