Trump denies wrongdoing and has accused Democrats of an “attempted coup.”
Democratic Senator Mazie Hirono told reporters: “That was one of the most bizarre things I’ve ever heard as a response.”
US President Donald Trump's lawyers were to wrap up their defense at his Senate impeachment trial on Tuesday but their hopes for a swift acquittal may be in jeopardy amid calls for more witnesses.
The Senate impeachment trial of US President Donald Trump is likely to begin in seven days with key players sworn in later this week.
House is expected to impeach Trump, the third impeachment in US history.