Election 2020 updates: Biden warns of 'dark winter,' pushes masks in pandemic plan

Twitter hit one of Trump's morning tweets with a label saying the content is "disputed and might be misleading about an election or other civic process."

In a tweet posted just after 10 a.m. ET, the president claimed that "surprise ballot dumps" are stealing the election away from him.

"Last night I was leading, often solidly, in many key States, in almost all instances Democrat run & controlled," he wrote. "Then, one by one, they started to magically disappear as surprise ballot dumps were counted. VERY STRANGE, and the 'pollsters' got it completely & historically wrong!"

In a follow-up tweet Wednesday morning, the president doubled down on his misleading claims about mail-in ballots, writing: "How come every time they count Mail-In ballot dumps they are so devastating in their percentage and power of destruction?"

The president has repeatedly attacked mail-in ballots throughout the campaign.

This late blue wave is not surprising because early voting and mail-in ballots were expected to be heavily Democratic.

Majority Leader Mitch McConnell said Wednesday that he thinks President Trump "ran a heck of a race."

"Everybody was writing him off," McConnell said. "He went out and really worked himself to death for the last two months with multiple rallies every day and turned it into a cliffhanger against everybody's expectation."

 Asked about the president falsely declaring victory, McConnell said, "It's not unusual for people to claim they've won the election, I can think of that happening on numerous occasions, but claiming you've won the election is different from finishing the counting."

"What we're going to see here in the next few days both in the Senate races and in the presidential race is each state will get to a final outcome and you should not be shocked if both sides are going to have lawyers there, both in these close Senate races and in the presidential contest," he said.

McConnell also changed his timeline on COVID-19 relief, saying he believes the Senate needs to do a relief package "before the end of the year." That's a departure from comments he made just before Election Day that relief ought to be taken up "right at the beginning" of next year. 

-ABC News' Allie Pecorin

Former Vice President Joe Biden has 69,543,071 votes tallied for him so far, breaking a record of most votes for any presidential candidate.

In 2008, then-candidate Barack Obama made history by winning 69,498,516 total votes, according to the FEC -- the most of any presidential candidate in history at that time. 

-ABC News’ Quinn Scanlan

Georgia’s Secretary of State Brad Raffensperger said that "every legal vote in Georgia will count" during a news conference Wednesday morning. 

Raffensperger said that his office has instructed the counties to finish tabulating results for this election today. 

"My team has sent reminders to counties to get all -- let me repeat all -- of our results counted today," he said. "Every legal vote will count." 

He added that the state has about 200,000 ballots that are left to be counted. 

Of those ballots left to be counted, Georgia officials said they do not know how many of them are coming from Fulton County, but a breakdown should be coming this afternoon.  

-ABC News’ Quinn Scanlan