RIVERSIDE, California — Rep. Ken Calvert (R-CA) has survived multiple redistricting efforts. The 72-year-old, who represents part of Southern California’s Inland Empire, is the longest-serving Republican in the state’s congressional delegation. He has held his seat for 33 years, watched his district be redrawn twice, and isn’t afraid of a fair fight.

But Calvert claims that Gov. Gavin Newsom (D-CA) and state Democratic lawmakers are trying to stack the deck against him and four other Republican representatives who are at risk of losing their seats if Proposition 50, a controversial redistricting ballot measure, is passed on Tuesday.