A new poll shows President Joe Biden has closed gaps in several battleground states in the days after his first debate against presumptive Republican nominee Donald Trump, which has prompted many to express concern about his mental fitness to serve another term in the White House.

A Bloomberg News/Morning Consult poll released Saturday showed Biden trailing Trump 47%-45% in the seven states that will most likely determine the winner of the Nov. 5 presidential election. It marks the second straight month of downward momentum for the former president, who peaked at 49% to the incumbent’s 43% in Bloomberg’s April 24 poll.