Rep. Justin Amash, seen here on Capitol Hill in June, says he is launching an exploratory committee for the Libertarian Party's 2020 presidential nomination. J. Scott Applewhite/AP hide caption

Barbara Sprunt
Voters cast their ballots in the midterm election in Brooklyn on Nov. 6, 2018. Angela Weiss/AFP via Getty Images hide caption
President Trump speaks during the daily briefing on the novel coronavirus on April 22, 2020. MANDEL NGAN/AFP via Getty Images hide caption
Response coordinator for White House Coronavirus Task Force Dr. Deborah Birx speaks as President Trump and Vice President Pence listen at Wednesday's briefing. Mandel Ngan/AFP via Getty Images hide caption
President Trump speaks during Tuesday's briefing from the White House coronavirus task force. Mandel Ngan/AFP via Getty Images hide caption
President Trump points to CNN journalist John Acosta during Monday's briefing with the White House coronavirus task force. Mandel Ngan/AFP via Getty Images hide caption
President Trump arrives as Dr. Anthony Fauci looks on during a coronavirus task force news briefing at the White House on April 4. Jim Watson/AFP via Getty Images hide caption
President Trump speaks about the coronavirus during Friday's briefing at the White House. Alex Brandon/AP hide caption
People in "close proximity" to President Trump and Vice President Pence will be tested for the coronavirus, the White House said on Friday. Mandel Ngan/AFP via Getty Images hide caption
Health care professionals prepare to screen people for the coronavirus at a testing site in Phoenix. Christian Petersen/Getty Images hide caption
Secretary of the Treasury Steve Mnuchin speaks while President Trump listens during Thursday's briefing from the White House coronavirus task force. Mandel Ngan/AFP via Getty Images hide caption
Sen. Bernie Sanders makes a point during the 11th Democratic Party presidential debate in March. Mandel Ngan/AFP via Getty Images hide caption
President Trump listens during Wednesday's press briefing with the White House coronavirus task force. Mandel Ngan/AFP via Getty Images hide caption
Russian President Vladimir Putin chaired a meeting with Russian regional officials via videoconference at the Novo-Ogaryovo residence outside Moscow, Russia, Monday, March 30, 2020. Mikhail Klimentyev/AP hide caption