Even as her lingering battle with Bernie Sanders has kept Hillary Clinton's campaign at least party focused on the remaining Democratic primaries, the super PAC supporting the former secretary of state has set its sights on a general election matchup with Donald Trump.

Priorities USA initially planned to unleash its first wave of anti-Trump ads beginning June 8, the day after contests in California, New Jersey and several other states at the end of the primary season. But on Monday, the group announced it would spend $6 million to air ads in Ohio, Florida, Virginia and Nevada beginning this Wednesday in the hopes of succeeding where Republican efforts to stop Trump failed.

"Donald Trump is a divisive, dangerous, con man who should never be president of the United States," Priorities spokesman Justin Barasky told CNN .

The super PAC, originally founded to aid President Barack Obama's re-election, has been working on Clinton's behalf since 2014. It previously announced plans to spend $130 million during the general election cycle.

The buy, Barasky said, was an indication that the group was preparing "for a close and competitive election," against Trump despite conventional wisdom and early polling showing Clinton with a healthy lead. The Clinton campaign, meanwhile, highlighted a poll last week showing a close race in several key swing states , wary Democrats will get complacent and give away a winnable race.

Priorities declined to characterize the nature of the new ads against Trump, but previous ads focused on violence at his rallies , his promise to appoint anti-abortion judges to the Supreme Court and his thin foreign policy credentials .

The urgency to shift Democratic Party resources to the general election comes as Trump dispatched his last two GOP primary rivals earlier this month and turned his focus toward unifying the Republican Party against Clinton.

The likely Democratic nominee, however, is still forced to contend with Sanders, the Vermont senator, who has refused to concede the race despite trailing Clinton by almost 300 pledged delegates and about 3 million votes.

When superdelegates are factored in, Clinton is just 143 shy of the 2,383 delegates necessary to win the nomination, a figure she is expected to easily reach by June 7, despite also losing some of the remaining contests.

While the Clinton campaign is taking increasingly confident steps toward the general election, opening field offices and sending the candidate to events in swing states that have already held primaries, it also resumed buying airtime for the extended fight against Sanders last week after making no new reservations since April 26.