Analysis

Mark Sandy, from the Office of Management and Budget, arrives to the U.S. Capitol earlier this month for a deposition regarding whether President Trump ordered a hold on military assistance to Ukraine. Sarah Silbiger/Getty Images hide caption

Candidates appear on stage at the start of the Democratic presidential debate at Tyler Perry Studios on Wednesday in Atlanta. Melina Mara/The Washington Post via Getty Images hide caption

Gordon Sondland, the U.S ambassador to the European Union, departs for a short break while testifying before the House Intelligence Committee in the Longworth House Office Building on Capitol Hill on Wednesday. Drew Angerer/Getty Images hide caption

Deputy Assistant Secretary for European and Eurasian Affairs George Kent and top U.S. diplomat in Ukraine William Taylor are sworn in prior to testifying before the House Intelligence Committee on Wednesday. Pool/Getty Images hide caption

A budget staffer is to become the first White House official to testify about Ukraine aid in the impeachment inquiry at the Capitol on Saturday. Joshua Roberts/Reuters hide caption

President Trump and Turkey's President Recep Tayyip Erdogan take part in a joint news conference during Erdogan's visit to the White House on Wednesday. Jim Watson/AFP via Getty Images hide caption

President Trump listens as Kentucky Republican Gov. Matt Bevin speaks during a campaign rally in Lexington, Ky., on Monday. Bevin is in a tight race for reelection. Susan Walsh/AP hide caption

Speaker of the House Nancy Pelosi gavels the close of the vote by the U.S. House of Representatives on a resolution formalizing the impeachment inquiry into President Trump. Win McNamee/Getty Images hide caption

A U.S. military vehicle drives past an oil pump jack in the countryside of Syria's northeastern city of Qamishli. President Trump is leaving some U.S. troops in Syria, with the goal of controlling Syria's oil fields. But legal experts say exploiting the oil could amount to pillaging — a war crime. Delil Souleiman/AFP/Getty Images hide caption

Democratic Presidential hopeful Sen. Bernie Sanders greets supporters during a rally in Queens, N.Y., earlier this month. NurPhoto/NurPhoto via Getty Images hide caption

A skull door knocker and cobweb decorations on the day before Halloween in Philadelphia. Bastiaan Slabbers/Getty Images hide caption

Sen. Elizabeth Warren, D-Mass., and entrepreneur Andrew Yang talk during a break in the Democratic presidential primary debate hosted by CNN/New York Times. John Minchillo/AP hide caption