Former Democratic National Committee Chairwoman Donna Brazile on Wednesday welcomed former New York City Mayor Michael Bloomberg back to the Democratic Party.

"Welcome!" Brazile tweeted just hours after Bloomberg officially announced he was re-registering as a Democrat.

Bloomberg posted on Instagram early Wednesday morning a picture of him filling out a New York state voter registration form.

"At key points in U.S. history, one of the two parties has served as a bulwark against those who threaten our Constitution," Bloomberg said. "Two years ago at the Democratic Convention, I warned of those threats."

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He continued, saying "today, I have re-registered as a Democrat – I had been a member for most of my life – because we need Democrats to provide the checks and balance our nation so badly needs."

Bloomberg, who has previously said he would consider a run for president in 2020 after the midterm elections, has been a Democrat most of his life.

But he switched over to the Republican Party in 2001 before registering as an independent in 2007.

His decision to register as a Democrat comes about a month before the November midterm elections, which Democrats are viewing as a great opportunity to seize control of the House and possibly the Senate.

Brazile said earlier this month that the party could be on the verge of an historic year.

“We say this every year, but this election has consequences,” Brazile said at the National Museum of African American History and Culture. “If we vote, this will be a historic year."

A new poll released by CNN on Tuesday showed that Democrats have a 13-point lead over Republicans on the congressional generic ballot.