Massachusetts senator criticized the Supreme Court's rejection to extend deadline for counting mail-in ballots in the battleground state.
"As the COVID pandemic rages," Justice Elena Kagan wrote in her dissent, "the Court has failed to adequately protect the Nation's voters."
The number of coronavirus patients in hospital has been rising in several states, including Texas, Utah and Wisconsin.
While the Democratic nominee has gained 3 percentage points since September, the president lost 2 points.
Joe Biden appears to be favored over Donald Trump in Arizona, Florida, Michigan, Pennsylvania, North Carolina and Wisconsin—although the margin is close in some of these battleground states.
"Why doesn't the president follow his administration's own guidelines at his rallies?" Fox News Sunday host Chris Wallace asked Jason Miller.
Nine out of 10 Biden supporters in Wisconsin said that the coronavirus outbreak is a reason they would elect him.
"One, President Trump's rallies pack people close together," said a Wisconsin doctor. "Two, his rallies give him a bullhorn to spread misinformation..."
A day before Trump's visit to Wisconsin, a local Republican county executive revealed that he'd tested positive for COVID-19.
Sgt. Michael Sturek, 39, with the Mauston Police Department in Wisconsin, is facing charges including felony second-degree recklessly endangering safety.
Only 39 percent of Michigan residents plan to vote for Trump, the new poll shows.
Several states in the Midwest of the country, including North and South Dakota, have reported the highest number of infections per capita in the last week.
Lynn BeBeau and her husband Mike turned detective to trace the origins of the little wooden boat which bore an inscription.
Prosecutors say there is no evidence that the rifle used in the shootings was ever possessed by the 17-year-old in Illinois.
Trump won each of the four states against Hillary Clinton in 2016, but a new poll shows Biden with single-digit leads in each.
The worst-hit metro areas were reported to be in Wisconsin, Texas, Idaho, Iowa, North and South Dakota, South Carolina and Montana, according to a new report.
President Donald Trump has been accused of inciting armed groups to attend polling places in November.
Mayor Dennis McBride said the decision about Officer Joseph Mensah's continued employment was "not in the hands" of his office.
A recent poll showed the former vice president had a higher level of public figure approval than the president.
Protests initially erupted in the Milwaukee suburb on Wednesday after the local district attorney declined to file charges against an officer in the fatal shooting of teenager Alvin Cole.
Wauwatosa law enforcement officers used tear gas against protesters over the February shooting death of Alvin Cole by a member of the Wauwatosa Police Department.
The 17-year-old is accused of two counts of first-degree intentional homicide following Kenosha shooting.
The Fox News host launched into a tirade against the former first lady who this week released a scathing attack on Donald Trump ahead of the U.S. election next month.
Tracy Cole, the mother of Alvin Cole, was arrested during Thursday protests over Alvin Cole's death at the hands of a Wauwatosa, Wisconsin police officer.
Wauwatosa police officer Joseph Mensah has fatally shot three people in five years, but has not faced charges in any of the shootings.
Wauwatosa police said they deployed tear gas twice to disperse crowds of protesters after a prosecutor declined to charge officer Joseph Mensah over the 17-year-old's shooting.
Democratic nominee Joe Biden may be leading nationally, but Democrat Hillary Clinton had a greater advantage over President Donald Trump this time in the 2016 election.
The campaign rally will now take place at the Janesville Regional Airport, according to President Donald Trump's campaign website.