Clinton will attend the weekly 10 a.m. House Democratic Caucus meeting on Capitol Hill.
"Money is pouring in for the party," a spokeswoman said.
"I may go a different route if things don't happen."
A majority of voters in swing states says Trump's attacks on a federal judge were racist.
Clinton leads Trump, 47 to 42 percent, in a new CNN/ORC poll.
The presumptive Democratic presidential nominee will speak Tuesday in Columbus, Ohio, at 11:30 a.m.
Trump ended May with just $1.3 million in the bank.
Sanders is ending the month with more than $9.2 million in cash on hand.
"I'm happy to see that there is some justice," the former Breitbart News reporter said.
Hillary Clinton’s campaign has more than $42 million in cash on hand.