Republicans are burning tens of millions of last-minute ad dollars to try to rescue three red-state senators who they say ignored months of warnings that their campaigns were in danger.

Why it matters: Senate races in Kansas, South Carolina and Mississippi are normally GOP layups. This year, Republicans have diverted resources from swing-state battles to defend them.

The frustration with Sens. Roger Marshall (Kansas), Darline Graham (South Carolina) and Cindy Hyde-Smith (Mississippi) comes amid broader GOP finger-pointing as polls show a nationwide backlash against President Trump .

"Democrats may win these seats in a wave ... but not a blue wave. It's the wave of arrogance [and] laziness ...…