Donald Trump to supporters: 'Our country is at stake like never before'

'They're trying to stop me because I'm fighting for you', said Trump

US President Donald Trump, the target of an impeachment investigation over alleged abuse of power, warned supporters that "our country is at stake like never before."

The video message posted on Twitter Saturday underscores the pressure on the White House as Democratic lawmakers charge aggressively into their investigation over accusations that Trump tried to arm-twist the Ukrainian president into providing dirt on one of his main 2020 election rivals, Joe Biden.

American rights are being threatened by Democrats, Trump said, stating that they "want to take away your guns, they want to take away your health care, they want to take away your vote, they want to take awayyour freedom." "We can never let this happen," he said.

"Because our country is at stake like never before. It's all very simple. They're trying to stop me because I'm fighting for you -- and I'll never let that happen."

In subsequent tweets, Trump repeated his charges that the impeachment investigation is a "Witch Hunt," and said Democratic lawmaker Adam Schiff, who is leading the impeachment probe, had defamed and libeled him, and should resign from Congress.

Congressional committees carrying out the impeachment inquiry have ordered Secretary of State Mike Pompeo to turn over Ukraine-related documents and will conduct interviews starting next week with five State Department officials. They include former ambassador to Ukraine Marie Yovanovitch, whom Trump reportedly forced out earlier this year for resisting his efforts to pressure Kiev to probe Biden.