Firing back at criticism for endorsing dictator Kim Jong Un’s claims that he had nothing to do with the death of American student Otto Warmbier in North Korea, President Donald Trump boasted Friday on Twitter that he helped return Warmbier to the U.S. and shifted blame onto former President Barack Obama.

Trump’s comments come a day after news conference in Hanoi, Vietnam, where he stated he took Kim “at his word” when he said he was unaware of the conditions faced by Warmbier, a college student who was imprisoned in North Korea for taking a propaganda poster and who died days after being returned to the U.S. in a vegetative state in 2017.

“I got Otto out along with three others,” Trump wrote Friday “The previous administration did nothing, and he was taken on their watch.”