Many election officials fear that the Trump administration is laying the groundwork to challenge the midterm results in November if they do not favor Republicans. Our White House correspondent Zolan Kanno-Youngs describes what the administration is doing.

Election officials say they worry the administration could use its own unsubstantiated claims to contest the vote in November.

At a rally in Arizona, the president dramatically escalated his attacks on news gathering and those willing to speak to the press.