It's both 100% constitutional and maybe a naked power grab (if it lacks proof). The House judges its members' electoral qualifications (Art. I, Sec. 5).

However, elections cases also sparked some of the most controversial and bitter partisan fights in the House history. https://twitter.com/Redistrict/status/1334512702203555846

E.g. Republicans removed Rep. James Butler (D-MO) twice in the 58th Congress. After the 2nd time the replaced him with Republican George Wagoner only 6-days before adjournment. Dems were so livid they launched a filibuster so intense it brought the House to a near standstill.

In response, Republicans enacted some of the most draconian anti-filibuster rules in House history.

From a marginal utility perspective, there's virtually nothing 223 representatives can do that 222 can't. Meanwhile, it's an awful high price to pay in exchange for probably nothing.

This is no longer routine House business. Short of demonstrable fraud, the House should apply the same standard to its elections as it does to the presidential elections.