Speaker of the U.S. House Nancy Pelosi holds the gavel as House members vote on two articles of impeachment against U.S. President Donald Trump in Washington D.C. Dec. 18, 2019. The Democrat-led U.S. House of Representatives voted on Wednesday to impeach Donald Trump for abuse of power and obstruction of Congress. As the vote ended, Trump became the third president in the U.S. history to be impeached. (Photos: Xinhua)

Speaker of the House Nancy Pelosi holds the gavel as House members vote on two articles of impeachment against Donald Trump in Washington D.C. Dec. 18, 2019. The Democrat-led U.S. House of Representatives voted on Wednesday to impeach Donald Trump for abuse of power and obstruction of Congress. As the vote ended, Trump became the third president in the U.S. history to be impeached.

U.S. House Speaker Nancy Pelosi speaks during a press conference after the House voted to impeach President Donald Trump in Washington D.C. Dec. 18, 2019. The Democrat-led U.S. House of Representatives voted on Wednesday to impeach President Donald Trump for abuse of power and obstruction of Congress.

U.S. House Speaker Nancy Pelosi (C) speaks during a press conference after the House voted to impeach President Donald Trump in Washington D.C. Dec. 18, 2019. The Democrat-led U.S. House of Representatives voted on Wednesday to impeach President Donald Trump for abuse of power and obstruction of Congress.

U.S. House Speaker Nancy Pelosi (C) speaks during a press conference after the House voted to impeach President Donald Trump in Washington D.C. Dec. 18, 2019. The Democrat-led U.S. House of Representatives voted on Wednesday to impeach President Donald Trump for abuse of power and obstruction of Congress.

U.S. House Intelligence Committee Chairman Adam Schiff (2nd R) speaks during a press conference after the House voted to impeach President Donald Trump in Washington D.C. Dec. 18, 2019. The Democrat-led U.S. House of Representatives voted on Wednesday to impeach President Donald Trump for abuse of power and obstruction of Congress.

U.S. House Judiciary Committee Chairman Jerry Nadler (C) speaks during a press conference after the House voted to impeach President Donald Trump in Washington D.C. Dec. 18, 2019. The Democrat-led U.S. House of Representatives voted on Wednesday to impeach President Donald Trump for abuse of power and obstruction of Congress.

U.S. House Speaker Nancy Pelosi (C) speaks during a press conference after the House voted to impeach President Donald Trump in Washington D.C. Dec. 18, 2019. The Democrat-led U.S. House of Representatives voted on Wednesday to impeach President Donald Trump for abuse of power and obstruction of Congress.

U.S. House Speaker Nancy Pelosi (R) speaks during a press conference after the House voted to impeach President Donald Trump in Washington D.C. Dec. 18, 2019. The Democrat-led U.S. House of Representatives voted on Wednesday to impeach President Donald Trump for abuse of power and obstruction of Congress.

House members vote on two articles of impeachment against U.S. President Donald Trump in Washington D.C. Dec. 18, 2019. The Democrat-led U.S. House of Representatives voted on Wednesday to impeach Donald Trump for abuse of power and obstruction of Congress. As the vote ended, Trump became the third president in the U.S. history to be impeached.

House members vote on two articles of impeachment against U.S. President Donald Trump in Washington D.C. Dec. 18, 2019. The Democrat-led U.S. House of Representatives voted on Wednesday to impeach Donald Trump for abuse of power and obstruction of Congress. As the vote ended, Trump became the third president in the U.S. history to be impeached.

U.S. President Donald Trump arrives at the White House in Washington D.C. Dec. 19, 2019. The Democrat-led U.S. House of Representatives voted on Wednesday to impeach President Donald Trump for abuse of power and obstruction of Congress.

U.S. President Donald Trump arrives at the White House in Washington D.C. Dec. 19, 2019. The Democrat-led U.S. House of Representatives voted on Wednesday to impeach President Donald Trump for abuse of power and obstruction of Congress.

U.S. President Donald Trump arrives at the White House in Washington D.C. Dec. 19, 2019. The Democrat-led U.S. House of Representatives voted on Wednesday to impeach President Donald Trump for abuse of power and obstruction of Congress.