President Trump announced on Twitter Wednesday that White House counsel Donald McGahn will be leaving his post this fall. Trump’s announcement came less than two weeks after The New York Times reported McGahn has been cooperating with Robert Mueller’s investigation. Three of McGahn’s deputies have already left the White House, and a fourth leaves tomorrow. This will leave Trump with just one deputy counsel. According to the Times, Trump had asked former staff secretary Rob Porter several times over the past year if he would take McGahn’s position, but Porter declined the offer. Porter resigned in February after both of his ex-wives publicly accused him of domestic violence.