"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 WarrenBrown launches tour in four early nominating states amid 2020 consideration Gillibrand announces exploratory committee to run for president on Colbert Native American group denounces Trump for using Wounded Knee in attack against Warren 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.