(CNN) A super PAC aligned with House Speaker Paul Ryan is opening a new front to lash a range of Democratic candidates in the final sleepy days of summer, part of a newly aggressive strategy to save the Republican Party's House majority -- at serious risk of flipping this fall.

The Congressional Leadership Fund will drop nearly $10 million this month to attack Democrats in 14 races from New York to California, an attempt to get a jump-start in the fall ad wars, force Democrats to spend money early and define the candidates in a negative light with voters, officials with the group tell CNN.

Most outside organizations have typically waited until after Labor Day to drop hard-hitting ads, betting that voters are vacationing and not fully engaged in the competitive midterm battlegrounds until Election Day draws closer. In the 2016 election cycle, the Congressional Leadership Fund waited until Sept. 13 to begin its air war.

But this year, Ryan's super PAC calculated that to save the majority, huge money needs to be spent aggressively and early -- especially as Democrats have a strong chance to pick up the 23 seats they need to flip the House. The group has pulled in more than $100 million for the cycle, which it also is investing heavily in a field program to turn out the vote in November, making it one of the biggest players in the battle for control of Congress.