Veteran Journalists Bob Woodward and Peter Baker talk about the House impeachment inquiry and how it compares to past impeachment investigations.

Missed the second half of the show? The latest on the House impeachment inquiry and how it compares to past impeachment investigations.

A dramatic new development could threaten one of President Trump’s defenses in the House impeachment inquiry. A second whistleblower has come forward, claiming to have firsthand knowledge of the president's July 25 phone call with the president of Ukraine. A lawyer for the new whistleblower said the person made a "protected disclosure and cannot be retaliated against." The president brushed it off on Twitter, saying "keep them coming." Weijia Jiang reports.

This week on "Face the Nation," Margaret Brennan talks to Representatives Eliot Engel and Jim Himes, and Senator Roy Blunt. Plus, a closer look at impeachment with Bob Woodward and Peter Baker.

In a city where leaks are a way of life, House Democrats are considering extreme measures to protect the identity of a whistleblower whose complaint sparked the impeachment process. There is also news that there is a second whistleblower. Major Garrett has the latest details from Washington.

Impeachment investigators today will hear from a key figure in President Trump's effort to get Ukraine to investigate former Vice President Joe Biden and his son. A new poll shows 58% of Americans support the House Democrats' decision to open an impeachment inquiry. Nancy Cordes reports.

Former Trump campaign manager Corey Lewandowski hosted an anti-impeachment rally to support Donald Trump in Manchester, New Hampshire on Monday. The president's longtime adviser has been hinting at a possible senate run in his home state against incumbent Democratic Senator Jeanne Shaheen. 2020 Campaign reporter Nicole Sganga joins CBSN for this edition of Daily Trail Markers.

A defiant White House sent House Democrats a letter saying it will not cooperate with the impeachment inquiry. On Tuesday, the administration blocked an ambassador from appearing before a house panel. Ben Tracy reports.

On Tuesday, the impeachment battle escalated when Republican Senator Lindsey Graham invited the president's lawyer, Rudy Giuliani, to testify about allegations of corruption involving the Bidens. The administration blocked Gordon Sondland, the U.S. ambassador to the European Union, from appearing before a House panel. Nancy Cordes reports.

President Trump's fight against the House impeachment inquiry is turning into a battle royal. In a letter to top congressional Democrats, the president's White House counsel called their inquiry "unconstitutional" and said Mr. Trump will not cooperate. The White House is daring House Speaker Nancy Pelosi to call for a vote on impeachment or take the president to court. Nancy Cordes reports.