Daily White House briefings with Trump and his coronavirus task force now often roll past 90 minutes.
Biden and Sanders say they will campaign exclusively online for now.
Biden has surged since scoring a decisive victory in the South Carolina primary on February 29.
Most national polls have both Biden and Sanders several points ahead of Trump in a general election matchup.
Two new national polls have shown Biden surging past Sanders.
Sanders leads Biden nationally in polling.
With 16 states are set to vote over the next two weeks, leftist firebrand Bernie Sanders is seeking to cement his status as frontrunner.
With a quarter of polling stations reporting just after 8:00 pm, Sanders was at 28 percent in the state where he routed Hillary Clinton in 2016.
Sanders for the first time claimed national frontrunner status in a new poll that also showed billionaire Michael Bloomberg vaulting into third place.
The Senate is to vote on Wednesday and the Republican president is all but certain of being acquitted.
Fourteen candidates are in the running to take on Trump -- and competing for much-needed donations.
He throws Republican senator Mitt Romney to the ground and strikes former president Barack Obama in the back and slams him against a wall.
Trump follows Bernie Sanders in creating a presence on the site.
Democrats Bernie Sanders, Nancy Pelosi and Cory Booker were all caught looking very unimpressed during Trump's first State of the Union address to Congress.
The spiders have a smiley-face pattern on their abdomens and are found across the Caribbean region.
Clinton's vanity shines through in her new book, What Happened, which fails to answer her critics' questions.
Clinton's book goes into detail about her emails, Donald Trump, Bernie Sanders and the election night itself.
Vermont senator criticised president's defence of far-right supporters in Virginia.
"Why are you so obsessed with her?" singer/songwriter Malynda Hale tweeted.
He "wasn't happy about the way things were going" but his political fanaticism came "out of the blue".
Sanders condemned actions of now-dead gunman.
Larry Sanders is standing for the Green Party in Oxford East.
