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Mark Sanford is running for president, here are some congressional basics

Rep. Mark Sanford, R-S.C., left, and Sen. Rand Paul, R-Ky., along with members of the House Freedom Caucus hold a news conference on Affordable Care Act replacement legislation on Wednesday, Feb. 15, 2017. (Bill Clark/CQ Roll Call)

The Republican presidential primary field looks small next to the Democrats, but at least one more player is joining. On Sunday, former South Carolina Governor and Congressman Mark Sanford announced his candidacy.

Sanford joins former Massachusetts Governor William Weld and former Illinois Congressman Joe Walsh in vying to unseat President Donald Trump at the nominating convention next summer.

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