Joe Biden accused President Donald Trump of abusing the powers of his office and ignoring everyone but his political base Monday in his first public rally as presidential candidate, arguing in the crucial battleground state of Pennsylvania that strengthening unions and promoting social and economic unity can restore Democrats to the White House.

The former vice president told hundreds of supporters and labor activists that Saturday’s deadly shooting at a California synagogue proves anew that the country is “in a fight for its soul.” But he spent more time criticizing Trump for his political behavior than for the president’s past comments concerning white supremacists, unlike Biden’s video formally kicking off his presidential campaign last week.

“There’s only one thing that stands in our way. It’s our broken political system that’s deliberately being undermined by our president to continue to abuse the power of the office,” Biden said.

He called Trump “the only president who has decided not to represent the whole country. He has his base. We need a president who works for all Americans.”