President Trump attacked Democrats, once again ridiculing the impeachment inquiry. Mr. Trump claims that Democrats want to take away everything from health care to guns. Natalie Brand reports.

President Trump and his Republican allies are fighting the Democrats' push toward impeachment by targeting the whistleblower in his case. The president tweeted Sunday night, "I deserve to meet my accuser." He says the whistleblower's information, claiming Mr. Trump asked Ukraine’s president to investigate Democratic rival Joe Biden, is "largely incorrect.” Nancy Cordes reports.

CBS News legal analyst Jonathan Turley testified before Congress in 1998 that President Bill Clinton could be impeached for lying under oath. He joins “CBS This Morning” to discuss what must be proven about President Trump's call with Ukraine for impeachment to move forward.

One of the members of that legal team, Rudy Giuliani, is being subpoenaed by three House committees. The former New York mayor is mentioned more than 30 times in a complaint drafted by the intelligence community whistleblower. Giuliani denies any wrongdoing. But has admitted pushing Ukrainian officials to investigate unsubstantiated claims of "wrongdoing by the Biden family." Nancy Cordes reports.

The impeachment showdown is intensifying. Secretary of State Mike Pompeo, who was hit with the first subpoenas, is pushing back against House Democrats' demands. Nancy Cordes has the latest.

In the impeachment inquiry, House Democrats are trading angry charges with Secretary of State Mike Pompeo. Democrats say the secretary could be involved in a "blatant cover-up and a clear abuse of power,” after Pompeo accused them of trying to intimidate State Department officials into testifying. Sources tell CBS News a former State Department official and a former ambassador have agreed to testify. Nancy Cordes reports.

It was a day like no other in American politics. It started with top Democrats warning the president not to intimidate witnesses in their impeachment inquiry. Weijia Jiang reports.

For the first time Thursday, a diplomat directly involved in U.S. talks with Ukraine will answer questions in the House impeachment inquiry. Kurt Volker, the State Department's former special envoy to Ukraine, was mentioned several times in a whistleblower report. Nancy Cordes reports.

The president's anger with the impeachment inquiry was on full display Wednesday. It included a profanity on Twitter and continued through the day, with the president throwing out insults, along with a series of false statements. Paula Reid reports.

CBS News senior national security analyst Fran Townsend was homeland security adviser to President George W. Bush. She's on the board of trustees at the McCain Institute, where former U.S. special envoy to Ukraine, Kurt Volker, is executive director. Volker resigned from his State Department post on Friday and will answer questions today in the House impeachment inquiry. Townsend joins "CBS This Morning" to discuss the challenges Volker faces when he speaks to Congress and the long-term implications of treating the whistleblower as a traitor.