A race by Democrats to remove President Donald Trump from office is gathering momentum as some of his fellow Republicans begin to turn on him.
Earlier in the day the president took no responsibility for the breach of Congress by supporters of his.
He will be succeeded by Joe Biden, a Democrat, on 20 January.
The House plans to vote on Wednesday to charge Mr Trump with inciting insurrection, which would make him only the second US president ever to be impeached twice.
What have Republicans said?
Two other Republican House members, John Katko and Adam Kinzinger, said they would also vote for impeachment.
House Republican leader Kevin McCarthy, a Trump ally who has said he opposes impeachment, has reportedly decided not to ask rank-and-file members of the party to vote against the measure.
According to the New York Times, Mr McConnell has told confidants he is pleased Democrats want to impeach the president because he believes it will help rid the Republican party of Mr Trump.
Mr McConnell has also told associates he believes the president committed impeachable offences, reports the Washington Post.
On Tuesday evening, House Republican Brian Fitzpatrick of Pennsylvania introduced a resolution to censure Mr Trump – a congressional rebuke less severe than impeachment.
The measure accuses Mr Trump of “trying to unlawfully overturn” the results of November’s presidential election and of having “imperiled a coequal branch of Government”.
What’s happening in Congress?
But in a letter to House Speaker Nancy Pelosi, Mr Pence said: “Under our Constitution, the 25th Amendment is not a means of punishment or usurpation.
“Invoking the 25th Amendment in such a manner would set a terrible precedent.”
Mr Pence’s refusal to go along means that Democrats will proceed to an impeachment vote as early as Wednesday lunchtime.
They could also use an impeachment trial to hold a vote blocking Mr Trump from ever running for office again. The president has indicated he plans to run again in 2024.
If Mr Trump is impeached by the House, he would have a trial in the Senate to determine his guilt.
The New York Times also reported on Tuesday that as many as 20 Senate Republicans were open to convicting the president.
A two-thirds majority of the upper chamber would be needed to convict Mr Trump, meaning at least 17 Republicans would have to vote for conviction.
What did Trump say?
He also told reporters: “This impeachment is causing tremendous anger, and you’re doing it, and it’s really a terrible thing that they’re doing.”
Mr Trump said the “real problem” was rhetoric used by Democrats during Black Lives Matter protests and violence last year.
The impeachment case centres on Mr Trump’s remarks at a rally outside the White House shortly before supporters of his attempted to storm the House of Representatives.
Mr Trump had repeated unsubstantiated claims of voter fraud, urging supporters to march on Congress as it was certifying Mr Biden’s election victory.
He called on them to “peacefully and patriotically make your voices heard”, but also to “fight like hell”.
Trump’s iron grip loosens
A growing number believe the unrepentant president’s actions last week threatened not just US democracy, but also their personal safety.
And even before the riot at the US Capitol, Mr Trump was increasingly viewed as a political liability with dwindling power. His scorched-earth challenge to the election results probably cost Republicans two Senate seats in Georgia, and there has been scant proof that Mr Trump boosts the party’s electoral chances when his name is not on the ballot.
Mr McConnell, among others, may be mulling whether a clean break with Trump is better for their political futures, even if it means working with Democrats to do the job.
What’s the latest in the riots investigation?
Rioters are being urged to turn themselves into police. A social media campaign is ongoing by members of the public to identify rioters from photographs taken last week.
It also said that investigations have concluded that two pipe bombs found near political party offices in DC had explosive igniters and timers.
Meanwhile it has been reported that the day before the riots, the FBI issued an internal report warning that extremists were planning to travel to Washington DC to commit violence.
The document, from an FBI office in Virginia, showed that plotters were sharing maps of the tunnels beneath the Capitol complex, according to US media.