Washington — President Donald Trump’s campaign has canceled $4.5 million in ad buys in key battleground states this week, raising more signs of trouble for his reelection effort, even as Democratic nominee Joe Biden expands his advertising footprint.

Faced with a shrinking cash balance, Trump has pulled back on television ads in all but three states where the race is close: Arizona, Florida and Georgia. And his ads have disappeared from must-win states like Ohio and Iowa, where he and Biden are essentially tied.

Biden is taking advantage of Trump’s retrenchment by widening the map, pouring $16 million more into 13 battleground states and