Sen. John McCain John Sidney McCainMcSally says current Senate should vote on Trump nominee Say what you will about the presidential candidates, as long as it isn't 'They're too old' The electoral reality that the media ignores MORE (R-Ariz.) said on Wednesday that he could return to the Senate as early as September.

"It's a tough challenge, you know, of course," McCain said in an interview on KFYI radio's "Mike Broomhead Show." "But I'm getting the best care you could possibly have. I'm eating well, I'm feeling fine, getting plenty of exercise. I expect Congress to go out here pretty soon, and I'll be ready to go back to work in September."

McCain was diagnosed with an aggressive form of brain cancer last month after undergoing a minor procedure to remove a blood clot from above his left eye.

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He returned to Washington last week ahead of a looming Senate vote on healthcare reform. The Arizona Republican joined two other Republicans, Sens. Lisa Murkowski Lisa Ann MurkowskiSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies McConnell says Trump nominee to replace Ginsburg will get Senate vote MORE (Alaska) and Susan Collins Susan Margaret CollinsSenate Republicans face tough decision on replacing Ginsburg Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy What Senate Republicans have said about election-year Supreme Court vacancies MORE (Maine), early Friday morning in voting down a "skinny" ObamaCare repeal bill.

In his interview with Broomhead on Wednesday, McCain said that the GOP healthcare plan would have "screwed" the people of Arizona. He also praised a bipartisan effort by the top lawmakers on the Senate Health, Education, Labor and Pensions Committee to hold hearings on stabilizing ObamaCare individual insurance markets.

McCain went back to Arizona on Monday to begin chemotherapy and radiation treatment.