The Congressional Leadership Fund, the main Republican super PAC focused on House races, announced Friday it will spread thousands of volunteers across 31 competitive legislative districts this weekend.

In what the group calls “Super Saturday,” the super PAC aims to contact over 400,000 voters through door knocking and phone banking. It’s the third such event for the group that is pledging to raise and spend $100 million to help Republicans maintain their hold on the House of Representatives.

“This election cycle, CLF is committed to doing things differently which is why we launched a data-driven, hyper-targeted field program to help Republican members win in the fall,” CLF Executive Director Corry Bliss said in a statement first reported on by NBC News. The group says its team has made over 15 million “voter contacts” since February 2017.

CLF raised $51 million in the second quarter of this year, announcing a $71 million war chest. In addition, CLF and its rival democratic-backed House Majority PAC have already reserved a combined $100 million in fall television and digital advertising.