With millions of absentee ballots still outstanding less than a week until Election Day, state election officials in at least six in critical swing states are revising their message for voters, now urging them to bypass the Postal Service and instead vote in person or hand-deliver their ballots to ensure they are delivered in time to be counted.

Officials in Michigan, Pennsylvania, Florida, Wisconsin, Georgia and Ohio have all put out calls in recent days warning voters about potential postal delays, encouraging voters to use drop boxes or deliver ballots by hand.

"It's now important to return your ballots in person. Don't rely on the mail," Michigan Secretary of State Jocelyn Benson told ABC News Live Prime Anchor Linsey Davis on Tuesday, adding the state is still waiting on more than 1 million absentee ballots to be returned.

Mail-in voting is expected to reach unprecedented levels this election cycle due to the health concerns of the novel coronavirus pandemic. But of the 88 million ballots voters requested, only half have been returned so far.

The last-minute push to bypass the Postal Service comes after months of concern from critics about the reliability of the mail in the electoral process, budgetary concerns with the agency and threats to cut services in a presidential election year -- fears that postal officials said were misguided. This summer, though, the post office warned state election officials that voters should send in their ballots no later than Oct. 27th in order to get them in on time in accordance with delivery standards.

The move also comes amid a background of litigation over extending mail-in ballot deadlines past Election Day, which Democrats generally favor and a push by Republicans and the Trump administration to end the process on Nov. 3.

-ABC News' Olivia Rubin, Kendall Karson and  Lucien Bruggeman

As Trump continues to downplay the realities of the coronavirus pandemic on his path to re-election, he will pitch himself to Nevada voters this afternoon but he will do it from Arizona -- after a rally in the Silver State last month violated coronavirus restrictions and left his campaign with hefty fines.

The shifting of his event, this time, across the banks of the Colorado River to Bullhead City, Arizona, comes as polls show Biden with a nationwide lead, advantage in swing states and with more trust in voters than Trump to handle the coronavirus pandemic.

Trump in a three-state tour Tuesday condemned Democratic leaders in Michigan and Wisconsin for imposing restrictions to combat the coronavirus crisis -- and is expected to do the same with Nevada’s governor Wednesday while on Arizona soil, where Republican Gov. Doug Ducey, a close ally to Trump, leads.

But Democrats aren't ceding the Western states to the GOP. Biden's running mate, California Sen. Kamala Harris, was in Nevada on Tuesday in an push to prevent the state from flipping to Trump and will campaign in Arizona Wednesday -- stopping in the cities of Tucson and Phoenix. 

Biden, meanwhile, is off the trail, spending the day in Wilmington, Delaware. He’s expected to receive a virtual briefing on the pandemic from public health experts, then give a speech on protecting health care and his plan to tackle the coronavirus crisis.

Democrats are playing on the offense in the homestretch -- focusing on states that Trump won in 2016. Biden took a trip to the red state of Georgia Tuesday and has plans to visit Florida, Iowa, Wisconsin and Michigan later this week. Trump's pitch to Nevada voters, where Clinton won by less than 2.5 percentage points, shows the campaign thinks the state's six electoral votes are within reach.

A surge in coronavirus cases has damaged Trump's re-election campaign in Wisconsin, with growing criticism of his work on the pandemic and preference for Biden to handle it. Biden holds a slighter advantage in Michigan, with sizable leads among women, moderates and independents in ABC News/Washington Post polls in both states.

Biden leads Trump by 57-40% among likely voters in Wisconsin, a state that's now reported to be third in the nation in per capita COVID-19 cases, with a 53% increase in average daily cases in the past two weeks, a record number of hospitalizations and a 112% jump in deaths. That compares with a closer 52-46% in mid-September.

In Michigan, it's 51-44%, Biden-Trump, among likely voters, a slight Biden lead in this poll produced for ABC by Langer Research Associates.

Behind it all, an atypical election clock is ticking. Thirty-seven percent of likely voters in Wisconsin, and 38% in Michigan, say they've already voted. And an additional 23% in Wisconsin, and 18% in Michigan, say they will vote early or absentee. Early voters are strong Biden groups. The share planning to vote on Election Day -- broadly for Trump -- has fallen from 51% last month to 39% now in Wisconsin. It's 43% in Michigan.

-ABC News’ Polling Director Gary Langer

Adm. Brett Giroir, a member of the White House coronavirus task force who was charged with leading the country's testing efforts at the beginning of the pandemic and has been careful not to break from the White House message, directly contradicted the president this morning when he acknowledged U.S. coronavirus cases are on the rise -- and not due to testing.

Trump said Tuesday, as he has throughout the pandemic, that the virus is going away and cases are rising due to increased testing -- but Giroir countered both of those points and warned "Draconian measures" may be required "if we don’t make a change."

"We do believe and the data show that cases are going up. It’s not just a function of testing," Giroir said in an interview this morning on NBC. "Yes, we’re getting more cases identified, but the cases are actually going up. And we know that, too, because hospitalizations are going up."

"It's not just a function of testing," Giroir added, calling the current moment a "critical point" in the country's pandemic response. He went on to remind Americans to practice social distancing, wear a face mask and avoid crowded, indoor spaces -- CDC guidelines which the Trump campaign itself has scantily adhered to.

"If we don't do those things, it may force local officials or government officials in the states to have more draconian measures because cases will go up if we don't make a change," Giroir warned. "The virus isn't acting on its own.”

The president has increasingly sought to tune out that reality as he holds mass gatherings day-after-day in the final stretch of his campaign, including in some of the hardest hit states. At those rallies, Trump has lamented over media coverage of COVID-19, claiming the coverage is intended to hurt his reelection chances. It comes as the U.S. reported a record of more than 500,000 new cases over the past week alone.

-ABC News' Brian Hartman