United States presidential election

Democratic presidential candidate, former Vice President Joe Biden and Jill Biden depart after placing a wreath at the Delaware Memorial Bridge Veterans Memorial Park, Monday, May 25, 2020, in New Castle, Del. (AP Photo/Patrick Semansky)

President Donald Trump turns after placing a wreath at the Tomb of the Unknown Soldier in Arlington National Cemetery, in honor of Memorial Day, Monday, May 25, 2020, in Arlington, Va. (AP Photo/Alex Brandon)

FILE - In this Sept. 9, 2019, file photo, President Donald Trump participates in a briefing about Hurricane Dorian with North Carolina Gov. Roy Cooper, left, aboard Air Force One at Marine Corps Air Station Cherry Point in Havelock, N.C. President Donald Trump demanded Monday, May 25, 2020, that North Carolina's Democratic governor sign off “immediately” on allowing the Republican National Convention to move forward in August with full attendance despite the ongoing COVID-19 pandemic. Trump's tweets Monday about the RNC, planned for Charlotte, come just two days after the North Carolina recorded its largest daily increase in positive cases yet.(AP Photo/Evan Vucci)

FILE - In this Feb. 25, 2020, file photo from left, Democratic presidential candidates, Sen. Elizabeth Warren, D-Mass., Sen. Bernie Sanders, I-Vt., former Vice President Joe Biden, and Sen. Amy Klobuchar, D-Minn., participate in a Democratic presidential primary debate in Charleston, S.C. Calls for pragmatic centrism helped Joe Biden clinch the Democratic presidential nomination. But they left many of the party’s strongest liberals worried that little progress would be made toward their sweeping goals. (AP Photo/Matt Rourke, File)

FILE - In this April 14, 2020, file photo, a mural that reads "There's No Place Like Home" is visible as a man wearing a mask crosses 14th Street in Washington. As a candidate for the White House, President Donald Trump once said he wanted “whatever is best” for the residents of the nation’s capital. But over the course of his more than three years in office a disconnect between the president and District of Columbia has emerged -- a chasm that has only grown during the coronavirus pandemic. (AP Photo/Andrew Harnik, File)

FILE - In this May 14, 2020, file photo House Speaker Nancy Pelosi of Calif., speaks during a news conference on Capitol Hill in Washington. Republicans are brandishing the latest approach in their uphill fight for House control this November: battering moderate Democrats for backing a $3 trillion coronavirus relief bill promising benefits for immigrants who entered the U.S. illegally. (AP Photo/Andrew Harnik, File)

FILE - In this Sunday, March 15, 2020, file photo, former Vice President Joe Biden participates in a Democratic presidential primary debate at CNN Studios in Washington. Biden won Oregon’s Democratic presidential primary, outpacing Vermont Sen. Bernie Sanders and Massachusetts Sen. Elizabeth Warren, who both suspended their campaigns earlier in the year. (AP Photo/Evan Vucci, File)

FILE - In this Sunday, March 15, 2020, file photo, former Vice President Joe Biden participates in a Democratic presidential primary debate at CNN Studios in Washington. Biden won Oregon’s Democratic presidential primary, outpacing Vermont Sen. Bernie Sanders and Massachusetts Sen. Elizabeth Warren, who both suspended their campaigns earlier in the year. (AP Photo/Evan Vucci, File)

President Donald Trump talks to reporters before departing the White House for a trip to Michigan, Thursday, May 21, 2020, in Washington. (AP Photo/Evan Vucci)

FILE - In this Dec. 18, 2019, file photo, Republican Senate candidate John James appears at a campaign rally for President Donald Trump in Battle Creek, Mich. James has been called a rising star of the Republican Party so many times it’s become a cliche, but his race against Sen. Gary Peters in a presidential battleground state has gotten dicier. (AP Photo/Paul Sancya, File)