Political organizations

Democratic presidential candidate Sen. Elizabeth Warren, D-Mass., waves after speaking at the Iowa Democratic Wing Ding at the Surf Ballroom, Friday, Aug. 9, 2019, in Clear Lake, Iowa. (AP Photo/John Locher)

Democratic presidential candidate Sen. Cory Booker, D-N.J., center, meets with supporters before the Iowa Democratic Wing Ding at the Surf Ballroom, Friday, Aug. 9, 2019, in Clear Lake, Iowa. (AP Photo/John Locher)

From left, Democratic president candidate and former Colorado Gov. John Hickenlooper, New York Mayor Bill de Blasio, Sen. Kirsten Gillibrand, D-N.Y., South Bend Mayor Pete Buttigieg, Sen. Michael Bennet, D-Colo., and Sen. Amy Klobuchar, D-Minn., stand together before the Iowa Democratic Wing Ding at the Surf Ballroom, Friday, Aug. 9, 2019, in Clear Lake, Iowa. (AP Photo/John Locher)

President Donald Trump talks to reporters on the South Lawn of the White House, Friday, Aug. 9, 2019, in Washington, as he prepares to leave Washington for his annual August holiday at his New Jersey golf club. (AP Photo/Evan Vucci)

Senate Majority Leader Mitch McConnell, R-Ky., smiles after vote on a hard-won budget deal that would permit the government to resume borrowing to pay all of its obligations and would remove the prospect of a government shutdown in October, at the Capitol in Washington, Thursday, Aug. 1, 2019. (AP Photo/J. Scott Applewhite)

FILE - In this Aug. 3, 2019 file photo, Senate Majority Leader Mitch McConnell, R-Ky., addresses the audience gathered at the Fancy Farm Picnic in Fancy Farm, Ky. The Republican Party, the Trump campaign and other GOP organizations say they are suspending their spending on Twitter to protest the platform’s treatment of Senate Majority Leader Mitch McConnell. Twitter temporarily locked McConnell’s campaign account after it shared a video in which some protesters spoke of violence outside his Kentucky home, where he is recovering from a shoulder fracture. (AP Photo/Timothy D. Easley, File)

FILE - In this May 9, 2019 file photo, House Ways and Means Committee Chairman Richard Neal, D-Mass., speaks during a hearing on Capitol Hill in Washington. (AP Photo/J. Scott Applewhite, File)

Democratic presidential candidate former Vice President Joe Biden speaks during a community event, Wednesday, Aug. 7, 2019, in Burlington, Iowa. (AP Photo/Charlie Neibergall)

In this Saturday, Aug. 3, 2019 photo, Senate Majority Leader Mitch McConnell, R-Ky., addresses the audience gathered at the Fancy Farm Picnic in Fancy Farm, Ky. A spokesman for Mitch McConnell says the Senate majority leader tripped outside his home in Kentucky and suffered a shoulder fracture. McConnell fell on his outdoor patio, but has been treated and released after getting medical attention. (AP Photo/Timothy D. Easley)