Rep. Mimi Walters will face Katie Porter in central Orange County's 45th district

"Katie Porter will challenge GOP Rep. Mimi Walters in November, setting up a pitched battle in a crucial House district.

Walters, first elected in 2014, represents one of the seven GOP-held districts Democrat Hillary Clinton won over President Trump in 2016. Four Democrats were on the ballot Tuesday fighting for a chance to unseat her this fall."

From The Los Angeles Times, 6/6/18