Attempts by conservatives to purge state voter rolls ahead of the November election, including from Donald Trump’s campaign and the Republican National Committee, are ramping up, prompting concern from the Justice Department that those efforts might violate federal rules governing how states can manage their lists of registered voters.

Donald Trump and his Republican allies are ratcheting up baseless claims that the Nov. 5 U.S. presidential election could be skewed by widespread voting by non-citizens in a series of lawsuits that democracy advocates say are meant to sow distrust.