The National Republican Congressional Committee is beefing up its ad spending again this week, according to independent expenditure reports filed with the Federal Election Commission. 

The committee is up with more than $4.2 million in additional ad spending this week, with nearly $350,000 going toward an ad buy targeting Rep. Mark Schauer (D-Mich.), who has emerged as one of the committee's top IE targets so far this cycle. 

The NRCC targeted the incumbent with a similarly sized ad buy in last week's round of IE spending. Schauer faces a rematch with former Rep. Tim Walberg (R) this fall. 

Other recurring NRCC targets this week: Reps. Ike Skelton (D-Mo.), Bobby Bright (D-Ala.) and Dina Titus (D-Nev.). The committee is up with new six-figure ad buys in each of those target districts. 

The NRCC is also hitting Rep. Alan Grayson (D-Fla.) with a nearly $200,000 ad buy and Reps. Stephanie Herseth-Sandlin (D-S.D.), Baron Hill (D-Ind.) and Suzanne Kosmas (D-Fla.).