President Joe Biden mistakenly called Vice President Kamala Harris Vice President Trump during a press conference on Thursday, marking his second word fumble that day.

I wouldnt have picked Vice President Trump to be vice president if [I didnt think] she was not qualified to be president, Biden said in response to the first question of the night, a reporters query about Harris ability to beat Trump if she were at the top of the ticket.

Earlier on Thursday, Biden made a similar mistake when he introduced Ukrainian President Volodymyr Zelenskyy as President Putin at a NATO conference.

A growing number of lawmakers have come forward with doubts about Bidens fitness for re-election following his unsteady debate performance last month, with some calling on him to drop out of the race and make way for a younger candidate.

At least half a dozen Democratic lawmakers made contingency plans in case Biden tanked Thursday nights press conference, Politico reported earlier in the day .