Darrell Issa is retiring from Congress

Rep. Darrell Issa
Rep. Darrell Issa (R-CA) on Capitol Hill. Photo: Mark Wilson / Getty Images

Rep. Darrell Issa (R-CA) announced today that he will not seek re-election. Issa marks the 21st Republican to announce his departure since Donald Trump became president.

What to watch: His seat will be particularly vulnerable in the 2018 midterm elections, as Hillary Clinton won his district by 7.5 points. Local outlet OC Daily reports that Republican Diane Harkey is expected to announce her candidacy for the seat, and Democrat Mike Levin has already begun his campaign.