Sen. Tim Scott to endorse Rubio
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South Carolina Sen. Tim ScottTimothy (Tim) Eugene ScottTrump rallies Republicans: ‘We’re just getting started’ Senate Republicans call on Trump to preserve NAFTA Steve Wynn resigns as RNC finance chair after sexual misconduct allegations MORE (R) is expected to endorse Sen. Marco RubioMarco Antonio RubioTrump must send Russia powerful message through tougher actions McCain, Coons immigration bill sparks Trump backlash Taking a strong stance to protect election integrity 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 GowdyHarold (Trey) Watson GowdyContractor awarded 6 million to provide 30 million meals to Puerto Rico only delivered 50,000: report The Memo: Trump doubles down amid some GOP doubts Lawmakers dispute ‘vindication’ for Trump in Intel memo 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 Olin GrahamMcConnell: 'Whoever gets to 60 wins' on immigration Overnight Tech: Uber exec says 'no justification' for covering up hack | Apple considers battery rebates | Regulators talk bitcoin | SpaceX launches world's most powerful rocket Overnight Cybersecurity: Tillerson proposes new cyber bureau at State | Senate bill would clarify cross-border data rules | Uber exec says 'no justification' for covering up breach MORE, South Carolina's other senator who ended his own presidential bid in December, is backing Bush.

Updated at 9:47 p.m.