Sen. Tim Scott to endorse Rubio
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South Carolina Sen. Tim ScottTim ScottIs Senate ObamaCare repeal bill too mean? The Hill's Whip List: GOP undecided, 'no' votes pile up on ObamaCare repeal bill Lawmakers celebrate National Selfie Day on Twitter MORE (R) is expected to endorse Sen. Marco RubioMarco RubioSenators urge Trump to do right thing with arms sales to Taiwan Why liberals should support Trump — not Obama — on Cuba policy The Memo: Trump seeks to put his stamp on nation 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 GowdyInvestigation shows DHS did not hack Georgia computers It's time for Republicans to play offense while Democrats are weak Gowdy won't use Oversight gavel to probe Russia MORE (R-S.C.), the chairman of the House committee investigating the 2012 Benghazi attacks.

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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 GrahamOvernight Cybersecurity: New ransomware attack spreads globally | US pharma giant hit | House intel panel interviews Podesta | US, Kenya deepen cyber partnership Graham gets frustrated in public ‘unmasking’ debate GOP senator: Don't expect Trump to 'have your back' on healthcare vote MORE, South Carolina's other senator who ended his own presidential bid in December, is backing Bush.

Updated at 9:47 p.m.