Pro-Trump groups raised more than $60m (€55m) in January and have more than $200m on hand for this year's general election, shattering fundraising records on the path toward a goal of raising $1bn this cycle.
The Republican National Committee and President Donald Trump's campaign have raised more than $525m since the start of 2019 together with two joint-fundraising committees.
The RNC and the Trump campaign provided the figures to the Associated Press. The January haul coincided with most of the Senate's impeachment trial, which resulted in the Republican president's acquittal earlier this month.
"We already have 500,000 volunteers trained and activated, and this record-breaking support is helping us grow our grassroots army even more," said RNC chairwoman Ronna McDaniel.
Mr Trump's 2020 campaign manager, Brad Parscale, said the Democrats' "shameful impeachment hoax and dumpster-fire primary process" have contributed to the "record-breaking financial support" for Mr Trump's re-election.
"With President Trump's accomplishments, our massive data and ground operations and our strong fundraising numbers, this campaign is going to be unstoppable in 2020," Mr Parscale said.
The pro-Trump effort said it has gained more than one million new digital and direct mail donors since Democrats launched their push to impeach Mr Trump in September 2019. The investigations proved to be a fundraising boon for Mr Trump's campaign, even as the president was personally frustrated by the scar it will leave on his legacy.
The Trump team's haul and cash on hand were twice that of former president Barack Obama's campaign and the Democratic National Committee at the same point ahead of his 2012 re-election.
In the week since his acquittal Mr Trump is demonstrating his determination to assert an iron grip on government, pushing his Justice Department to ease up on long-time friend Roger Stone while using the levers of presidential powers to exact payback on real and perceived foes.
Mr Trump has told confidants in recent days that he felt both vindicated and strengthened by his acquittal in the Senate, believing Republicans have rallied around him in unprecedented fashion while voters were turned off by the political impeachment process.