The Trump administration is threatening California with steep fines and legal action days after a transgender athlete won two statewide high school track-and-field events, ramping up the legal threats aimed at the state over transgender issues.

The president posted Monday on social media that Gov. Gavin Newsom “fully understands, large scale fines will be imposed” following AB Hernandez’s participation in three events.

Trump threatened to fine California after a trans athlete shared the podium at a track meet Saturday under a state rule that allows trans athletes to compete as long as they don’t bump cisgender girls from the medals.