Republican Josh Hawley raised a little more than a third of what Missouri Sen. Claire McCaskill did during the first quarter of this year.
Hawley's campaign reported Thursday that it raised $1.5 million from January through March. The Democratic senator's campaign reported last week that it had raised more than $3.9 million.
McCaskill also ended March with five times as much cash on hand as Hawley. She reported having $11.5 million to Hawley's $2.1 million.
Hawley is the state's attorney general and the leading GOP Senate candidate. President Donald Trump headlined a March fundraiser for him.
Hawley has said McCaskill is raising so much money because she is a longtime politician with liberal donors. McCaskill spokeswoman Meira Bernstein tweeted that the numbers show that the momentum is behind the senator.