Oakland Mayor Libby Schaaf tossed out the first pitch at Monday’s night A’s game with a looping strike. A half-inning later, Schaaf threw a brush back pitch at President Trump, implying in a tweet, that she would blow the whistle again on any U.S. Immigration and Customs Enforcement (ICE) raids, if any are planned for Northern California.

Trump tweeted Monday night that ICE would begin next week “removing the millions of illegal aliens who have illicitly found their way into the United States.”

More than an hour later, Schaaf implied she would warn undocumented immigrants of an ICE raid, if she receives credible information of any impending actions, she tweeted at the president.

In February 2018, Schaaf made national headlines when she alerted undocumented immigrants in the region that she had knowledge that raids were imminent. She turned out to be correct. The administration claimed to have targeted 1,100 undocumented immigrants. Just 200 were arrested by ICE agents.

Thomas Homan, the then-acting head of ICE, equated Schaaf to a “gang lookout” and Trump asked his U.S. Attorney General at the time, Jeff Sessions, to prosecute Schaaf for obstruction of justice. “The Libby Schaaf Act of 2018″ was later introduced by Rep. Steve King to threaten jail time for officials disclose ICE raids to the public.