"I don't have to tell anybody here that our country today faces enormous problems," he said outside of a Senate Democratic retreat in West Virginia. "We have a delusional president, who is way out of touch with the needs of the people of West Virginia and working people all over this country." 
 
Senate Democrats — including Sanders and Sen. Elizabeth WarrenElizabeth Ann WarrenSupport drops for Medicare for All but increases for public option Hillicon Valley: Warren takes on Facebook over political ads | Zuckerberg defends meetings with conservatives | Civil liberties groups sound alarm over online extremism bill Feehery: Trump may be down, but he's not out yet MORE (D-Mass.) — rallied with marchers gathered outside of the retreat, urging the crowd to fight back against Trump and the GOP's effort to repeal the Affordable Care Act. 
Sanders added that the only way Democrats could "beat" Republicans is "through a massive grassroots effort." 
 
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"We saw what that grassroots effort is about on Saturday with the women's march all over America," he said, referring to worldwide marches that drew millions of people, to yells and cheers from the protestors.  
 
Warren added on Thursday that protestors had to be ready to "fight back" against the unified GOP government. 
 
"The Republicans have the power in Washington. They have the Senate. They have the House," she said to boos from the crowd. "They have the White House, so it is now up to us." 
 
She added that "we can whimper, we can whine or we can fight back. ... Are you ready to fight back?"
 
Senate Democrats are holding a closed-door retreat this week in West Virginia, which Trump carried by more than 40 points, while congressional Republicans huddle in Philadelphia. 
 
Democrats face an uphill battle to block the GOP effort to repeal the Affordable Care Act, which only needs support from 50 senators. 
 
Sen. Charles SchumerCharles (Chuck) Ellis SchumerTrump defends 'crime buster' Giuliani amid reported probe Louisiana voters head to the polls in governor's race as Trump urges GOP support Trump urges Louisiana voters to back GOP in governor's race then 'enjoy the game' MORE (N.Y.), the Senate's top Democrat, told USA Today earlier this week that he thought Democrats had a 50-50 shot at stopping repeal, but acknowledged they would need GOP support.