U.S. Vice President Kamala Harris indirectly criticized former President Donald Trump on Sunday, suggesting her opponent in the Nov. 5 election was a “coward” whose politics focused on putting down rivals.

The remarks came in a campaign appearance in the critical battleground state of Pennsylvania with running mate Minnesota Governor Tim Walz, before Harris heads to the Democratic National Convention in Chicago, which kicks off Monday.

“Over the last several years there’s been this kind of perversion that has taken place, I think, which is to suggest that the measure of the strength of a leader is based on who you beat down. When what we know is the real and true measure of the strength of a leader is based on who you lift up,” Harris told a crowd of supporters. “Anybody who’s about beating down other people is a coward.”

She did not directly name Trump, who in a campaign appearance Saturday in eastern Pennsylvania referred to Harris as a “radical” and a “lunatic.”