Sen. Bernie Sanders is pushing for delaying the Wisconsin primary that is scheduled for next Tuesday.
Sanders, I-Vt., wants the swing state to follow the lead of 15 other states that have delayed their votes over the coronavirus pandemic.
"People should not be forced to put their lives on the line to vote," he said in a statement.
"The state should delay its primary extend early voting and switch to entirely vote by mail," Sanders added.
There was no immediate comment from the campaign of Democratic front-runner Joe Biden.
Sanders urged his supporters to vote by absentee ballot in Wisconsin, a state he won in 2016 against Hillary Clinton.
Even though Biden has forged a commanding lead in the delegate race, Sanders has refused to end his campaign.
Four years ago, disgruntled Sanders supporters never fully backed Clinton, a key factor in President Donald Trump's narrow Electoral College victory.
