Former President Barack Obama praised members of his administration for “continuing to fight for an America that’s better” after nearly 150 African Americans signed an op-ed slamming President Donald Trump for his recent racist attacks targeting four progressive Democratic congresswomen of color.

“I’ve always been proud of what this team accomplished during my administration. But more than what we did, I’m proud of how they’re continuing to fight for an America that’s better,” Obama, who has been notoriously restrained since leaving office when it comes to publicly speaking out about Trump’s policies and behavior, wrote on his Twitter account on Saturday. Obama’s former senior adviser Valerie Jarrett was also a signatory of the op-ed.