Elon Musk is threatening to leave his roles on a pair of White House councils if President Donald Trump pulls the U.S. out of the Paris climate accord, the Tesla CEO said on Twitter Wednesday.

Musk said in a tweet that he’s done “all I can” to advise Trump to remain in the accord, under which the U.S. and other nations have pledged to reduce greenhouse gas emissions. In a reply to a Twitter user who asked Musk what he will do if Trump does halt U.S. participation, the Tesla TSLA, +1.23% chief wrote, “Will have no choice but to depart councils in that case.”

Don't know which way Paris will go, but I've done all I can to advise directly to POTUS, through others in WH & via councils, that we remain — Elon Musk (@elonmusk) May 31, 2017

Will have no choice but to depart councils in that case — Elon Musk (@elonmusk) May 31, 2017

Musk had faced pressure over his joining these White House advisory groups from Trump critics.

Trump tweeted he will make an announcement about the Paris deal “over the next few days” but did not indicate his intentions. Reports have said he intends to leave the 2015 agreement. Doing so would be a major reversal to the Obama administration’s climate-change efforts.

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