In Wisconsin, Democratic Governor Tony Evers has refused calls to cancel primary elections set for April 7 and will activate the Army National Guard to work at polling places, despite an explosion in coronavirus cases and 25 deaths. In Milwaukee, election officials are set to invalidate more than 450 absentee ballots that were signed without a witness’s signature, as required by law, despite statewide social distancing orders that have been in effect since March 24.

Vermont senator and presidential candidate Bernie Sanders pleaded with Wisconsin to delay voting, writing, “People should not be forced to put their lives on the line to vote, which is why 15 states are now following the advice of public health experts and delaying their elections.”

This comes as at least three poll workers in Florida have tested positive for COVID-19 since Florida’s March 17 primary — two in Broward County and one in Jacksonville.

Meanwhile, Democratic front-runner Joe Biden called Wednesday on the Democratic National Committee to delay its presidential nominating convention in Milwaukee, from mid-July to August.