Mr. Kerik, a close ally of the pro-Trump lawyer Rudolph W. Giuliani, was asked about Mr. Trump’s fund-raising efforts and attempts to investigate fraud in the 2020 election.
Denver Riggleman, a former staff member of the House committee investigating the assault on the Capitol, said the call came from a White House landline.
Several prominent promoters of election misinformation are backing a slate of Republican candidates running for secretary of state in races across the country.
Testimony disclosed by the House committee investigating the riot showed that Mark Meadows and Freedom Caucus members discussed directing marchers to the Capitol as Congress certified the election results.