TRENTON, N.J. (AP) — New Jersey went on tallying votes Wednesday in a handful of primaries after COVID-19 upended the state's election by turning it into a mostly mail-in event.

Results in the Republican contest for Senate, as well as a high-profile GOP House contest in southern New Jersey's 3rd District, among others were unable to be called by The Associated Press.

The uncertainty was expected since Democratic Gov. Phil Murphy mandated the election take place mostly by mail because of the coronavirus outbreak. Ballots postmarked by 8 p.m. Tuesday can continue to be counted until July 14, and issues with signatures can be remedied until July 23.

It was the first ever statewide election to be conducted mostly by mail-in ballots.

There's uncertainty also surrounding how the fall election will play out and whether Murphy could move to make that a nearly all-mail contest as well if there's a flare up of the virus.

It would take days to give the primary “the post-mortem that it needs," the governor said this week, adding during a news conference Wednesday that “our sense is it went well.”

Democratic state committee chair John Currie said in an emailed statement he thought Murphy would decide what to do based on “data." He added that he thought the general elections would balance health and maximum voter participation.

Republican National Committeeman Bill Palatucci didn't explicitly oppose the possibility the governor could move to a nearly all-mail election like the primary.

“Listen I think he’s right to be undecided," he said “I respect his need and desire to balance the integrity of the election process with public safety. But I think we all need more information particularly on the turnout.”

Typically voting by mail is an unremarkable event, and five states conduct all-mail elections.

But this year, the issue has taken center stage because President Donald Trump criticized states' efforts to expand access to voting by mail instead of waiting in line at polling places during the outbreak.

Though, it was an issue in New Jersey's municipal primary in May. Four men, including an incumbent Paterson council member and a member-elect, were charged criminal by the state attorney general over election fraud. They've denied wrongdoing, but the episode grabbed the attention of the president, who tweeted critically about the northern New Jersey city.

Winners on Tuesday included former Vice President Joe Biden, who defeated Sen. Bernie Sanders in the Democratic presidential primary, even though the senator wasn’t competing. Democratic incumbent Sen. Cory Booker won, as did Amy Kennedy a former history teacher from southern New Jersey and the wife of former Democratic Rep. Patrick Kennedy, in the 2nd District’s Democratic primary.

She'll go on to face Republican Jeff Van Drew, who left the Democratic Party this year because he opposed impeaching Trump.