Starting early Wednesday, the campaign and the Republican National Committee have been sending dozens of daily text messages and emails saying they need financial support to challenge voting procedures.

“We must PROTECT the Election!” says one campaign text Friday signed by Mr. Trump’s son Donald Trump Jr. “My father’s calling on YOU to help bolster our critical Election Defense Fund.”

Clicking through to the donation page, potential givers can review a disclaimer that 50% of any contribution will be used for general election campaign debt retirement and 50% for the campaign’s recount account.

Other Trump fundraising pitches in recent days ask for help to “protect the integrity of this election” but lead to a donation page for Mr. Trump’s “Make America Great Again” committee. The fine print on those solicitations says 60% of a contribution helps the campaign retire debt and 40% goes to the Republican National Committee.