McCarthy threatened to investigate the DOJ and Merrick Garland after an FBI raid on Mar-a-Lago.
He currently has no power to do that, but would if the GOP retakes the House in the mid-terms.
Trump allies are seeking to portray the probe as politically motivated.
House Minority Leader Kevin McCarthy threatened to investigate the DOJ and Attorney General Merrick Garland, using powers the Republican Party would gain if it retakes the House in November.
The investigation was in response to a Monday FBI raid on Donald Trump's Florida home, Mar-a-Lago.
In a statement Tuesday, McCarthy denounced the search conducted by FBI agents in Trump's Mar-a-Lago resort.
Multiple reports said the raid was part of an investigation into the handling of classified information after Trump left office in January 2021.
"I've seen enough. The Department of Justice has reached an intolerable state of weaponized politicization," McCarthy said in a statement.
"When Republicans take back the House, we will conduct immediate oversight of this department, follow the facts, and leave no stone unturned."
"Attorney General Garland, preserve your documents and clear your calendar," McCarthy said.
McCarthy told Punchbowl News newsletter he was considering appointing a special investigative committee as the vehicle to carry out his plan, but said it was still in the early stages.
"I gotta talk to my members and see where we go," McCarthy told the outlet.
After news of the raid broke, Trump denounced it as "political persecution" and said agents had broken into a safe. He is the first former president to have their property raided as part of a federal investigation.
Allies of Trump echoed the criticism, claiming the FBI was part of a political plot against Trump, who has openly flirted with a 2024 campaign to regain the presidency.
The House has broad powers to scrutinise and investigate branches of government, including potential abuses of power by officials.
McCarthy hasn't laid out a specific basis for launching an investigation.
Among the key aims of Garland since taking office, according to reports, has been to reestablish the Justice Department's independence after its politicization under Trump.
White House aides said they had no warning about the raid and learned about it from social media, CBS News reported.
The DoJ is currently investigating President Joe Biden's son, Hunter Biden, on tax crime allegations. Some commentators noted that the raid came at a politically inconvenient time for Biden, who is trying to capitalize on recent successes in Congress, particularly the passage in the Senate of the Inflation Reduction Act.
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