The next US House seat that is a vulnerable Republican seat is California's 25th District.
It is held by Republican Steve Knight. Against the will of American voters, he opposes gun control laws, even after this year's deadly shootings. He supported cutting healthcare from the poor and tax cuts for the rich. He desires to send immigrants back to their country of origin (even to hostile reception in places like Syria), while desiring increased hostilities in Syria and etc. He was one of only 3 Congressmen to oppose removing Confederate flags in California. He opposes environmental protections on greenhouse gases that promote climate change. He says Social Security is a "bad idea."
The state of California voted for Clinton in the 2016 election, and he only won his own election by 6 percent...and polls have swung that much and more in one year.
The leading opponents with the biggest campaign pockets from this site is Bryan Caforio and Katie Hill.