Louisiana Sen. Bill Cassidy cited recent elections where Trump-supported Senate candidates in swing states all lost their races.
Raising the retirement age would be highly controversial and Congress is not likely to do so anytime soon.
Trump loyalists and critics of the ex-president weighed in after dined with a white nationalist and Holocaust denier over the weekend.
Sen. Bill Cassidy (R-La.) floated a feral case for unfettered access to AR-15 assault-style rifles, a weapon of choice for mass killers.
"Elections are about winning," the Louisiana Republican said.
"Republicans, by the way, are guided by science," Sen. Bill Cassidy told the Native American congresswoman, despite his past vote rejecting climate science.
Multiple lawmakers publicly supported some kind of investigation into the deadly Capitol riot, a day after the Senate voted to acquit Trump in his impeachment trial.
Cassidy was one of seven GOP senators to join Democrats in voting to convict the former president of incitement.
"He is guilty," Bill Cassidy of Louisiana said.
Last year was the fourth-deadliest in the nation for right-wing extremist violence, according to data from the Anti-Defamation League's Center on Extremism.