Xavier Becerra California&nbsp;Atty. Gen.&nbsp;Xavier Becerra on Thursday formally announced his bid to run for election to the post in 2018, telling supporters&nbsp;he is ready to continue to battle the Trump administration when he thinks&nbsp;the president is trampling on rights.&ldquo;The stakes could not be higher,&rdquo; Becerra wrote in an email to supporters. &ldquo;Only a few days after I took the oath of office as California Attorney General, the White House began issuing unconstitutional and un-American executive orders that shouldn't see the light of day.&rdquo;Becerra, 59, was appointed by Gov. Jerry Brown to fill the last two years of&nbsp;Kamala Harris' term after she&nbsp;was elected to the U.S. Senate. Becerra has already filed friend-of-the-court briefs in two lawsuits challenging Trump&rsquo;s travel bans.&ldquo;I want to fight for your rights from start to finish &mdash;&nbsp;until we put every dangerous idea and policy six feet under ground,&rdquo; Becerra wrote.The incumbent will face challengers in 2018, with announced candidates so far including Democratic Insurance Commissioner Dave Jones and Republican San Bernardino County Dist.&nbsp;Atty. Mike Ramos.