While the former vice-president remains popular, the Democrats may not need him to stand against Trump.
Trump's move to redirect funds to build his promised border wall has been challenged with lawsuits.
While Democrats have expressed the desire to get started on their policy agenda, they have also been eager to act as a check on Trump.
Trump says in a tweet that if Democrats didn’t give him all the wall money he’s demanded, he may use executive action to build it.
Trump and Chinese officials projected optimism after negotiations aimed at reaching a trade agreement.
Trump signals the address to include extensive remarks about his standoff with Democrats over building a wall along the US-Mexico border.
Trump has threatened a resumption of the record-long shutdown if the panel fails to find common ground or produces a plan he does not like.
The longest shutdown in US history ended on Friday when President Donald Trump and Congress agreed to temporary government funding.
Harris joins Senator Elizabeth Warren of Massachusetts and Hawaii congresswoman Tulsi Gabbard, among others, in vying for the 2020 Democratic nomination.
Trump's lawyer Rudy Giuliani calls the allegation in the BuzzFeed report "categorically false" in a comment sent to several White House reporters.
Exasperated Democrats called Trump's behaviour a "temper tantrum" and said the meeting broke down when they refused to commit to funding his proposed southern border wall.
In a sombre appeal to the nation, Trump spoke of Americans who have been "savagely murdered in cold blood" by immigrants who crossed illegally into the United States.
Trump tartly dismissed the threat of impeachment, while the newly elected Democratic House Speaker Nancy Pelosi appeared loath to reign in the congresswoman's language.
The tussle over the Mexican border wall has led to a shutdown of the US government that has lasted nearly 2 weeks.
Among the first tasks of the 116th Congress will be ending the shutdown.
Trump's comments came after the deaths of two Guatemalan children who crossed the border illegally with relatives who were taken into custody by US Border Patrol.
Trump is demanding US$5 billion for the Mexico border wall, while Democrats have proposed US$1.3 billion for border security.
While negotiations to resolve the impasse are underway, it’s not clear whether parts of the government will remain shuttered for days or weeks.
Fears of a shutdown sent US stocks tumbling, with the Dow closing down 2.0%.
Republicans presently control Congress, including 51 seats in the 100-member Senate.
Democrats, who have seen the law survive scores of legal and legislative attacks, vowed to fight back, saying the health coverage of millions of Americans is at stake.
Hong Kong legislator Eddie Chu is the first person to be blocked from standing in rural village elections after poll officials decided he is pro-independence.
Democrats have also questioned if Whitaker was properly appointed to the position.
Senate Democrats were pondering suing Trump, the sources said, on the grounds that, in naming Whitaker, the president ignored a statutory line of succession at the Justice Department.