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At the same time, the Republican National Committee, newly under the former president's control, has seeking to limit certain aspects of mail voting. That includes laws in some states, including Nevada, that allow late-arriving mailed ballots to be counted as long as they are sent by Election Day.

“If Donald Trump is serious about finally recognizing that mail voting is a great option for voters to utilize this November, he should demand the RNC and his MAGA allies drop every one of these lawsuits throughout the country,� Biden's campaign manager, Julie Chavez Rodriguez, said in a statement, referring to Trump's “Make America Great Again� movement.

Republicans said there is no contradiction between supporting mail voting and suing to make it more secure. In their Nevada challenges, they contended that the state’s procedures for counting mail ballots received after Election Day opened the door to possible fraud.

“Democrats are playing dumb about a very simple concept: We support mail voting, but we also support safeguards to make mail voting secure,� said Danielle Alvarez, a spokeswoman for the RNC and the Trump campaign. “It's really not hard: The left should stop its assault on the foundation of our election system and accept that Americans don't agree with their extreme attempts to make voting less secure.�

The Biden campaign noted that in the weeks before Trump announced a “Swamp the Vote� campaign to encourage voting by mail, the RNC filed two lawsuits attacking that method in Nevada, a pivotal swing state. One challenged the ability of Nevada — and any state — to ; the second targeted Nevada's acceptance of mail ballots lacking a postmark for up to three days after Election Day.

The litigation follows an RNC case seeking to from accepting post-Election Day mail ballots, as well as several other cases in Michigan, Pennsylvania and Wisconsin.

Trump's were a centerpiece of his that voter fraud cost him the 2020 election, a falsehood that helped spur the on the U.S. Capitol. Since then Republicans have to mail balloting in several states.

Trump also has taken direct control of the RNC, appointing as its co-chair along with who echoed the former president's of fraud in 2020.

Before Trump's attacks, GOP voters cast mail ballots at comparable rates to Democrats, but since 2020 they have fallen sharply behind. Many Republican operatives have at Trump's criticism because it is considered an advantage for campaigns to get supporters to vote early.

That is part of what pushed Trump to embrace mail balloting, though it has been a contradictory effort. He still that mail ballot fraud cost him reelection against Democrat Joe Biden.