The commitment, according to the campaign, includes a $6 million TV and digital ad buy set to launch next Monday and last through Election Day.
The campaign also is sending $3 million to the Republican National Committee to boost GOP campaigns, while Trump plans to host at least 10 more "Make America Great Again" rallies in support of Republicans before the election.
At the two-week mark, Republicans are seen as holding the edge in the race for control of the Senate while Democrats remain favored in the race for the House -- but their advantage is narrowing in recent polling.
"He's campaigning at a higher level than any president previously," Republican National Committee Chairwoman Ronna McDaniel told Fox News' "America's Newsroom" on Monday.
The Democratic National Committee has raised $136 million so far this cycle, including $9.6 million in September, compared with the RNC’s $26.2 million.