Sen. Bernie Sanders (I-VT) seems closer to putting his full support behind his opponent for the White House, Hillary Clinton, to further strengthen her campaign against the Republican Party’s presumptive nominee, Donald Trump.

“We have got to do everything that we can to defeat Donald Trump and elect Hillary Clinton,” Sanders said Thursday to a Bloomberg reporter for a PBS program. “I don’t honestly know how we would survive four years of a Donald Trump [presidency].”

Sanders has before said he would fight for the nomination up to the Democratic National Convention later this month. But when asked Wednesday night on MSNBC if he was “not denying” the report that there were talks of a potential endorsement, Sanders replied, “that’s correct.”

Clinton was declared the party’s presumptive nominee at the beginning of June.