Marco Rubio rants about unnamed sources in Twitter tirade

Former Republican hopeful Marco Rubio offered a glimpse of his future on Monday — and it appears to involve a lot of working out.

The Florida senator unleashed a late-night Twitter tirade that included sarcastic tweets about “whether to chest or legs tomorrow at gym.”

A source "close to Rubio" says he was tired after long day & has decided to sleep for a few hours before tomorrow's ZIKA debate in Senate.

— Marco Rubio (@marcorubio) May 17, 2016

A "longtime friend" says Rubio is "betwixt and between when it comes to whether to chest or legs tomorrow at gym."

— Marco Rubio (@marcorubio) May 17, 2016

According to source who knows his cousins, wife's dentist, Rubio could do cardio instead.

— Marco Rubio (@marcorubio) May 17, 2016

The rant followed a story in the Washington Post that suggested he was lost at sea in terms of his political future.

“Rubio, according to conversations I’ve had with people close to him, is sort of betwixt and between when it comes to his next move,” according to Monday’s story by the Post’s Chris Cillizza.

In response, the 44-year-old Rubio issued a flurry of messages about how he was spending his time, his ambitions and reporters “desperate for content.”

Unnamed sources "close to" often just people who want to sound like they are in the know. And reporters desperate for content just accept it

— Marco Rubio (@marcorubio) May 17, 2016

Word of advice, people often claim to know more than they really do because they enjoy status of being perceived as "in the know".

— Marco Rubio (@marcorubio) May 17, 2016

Another genius line claims that Im "a bit at sea in terms of his next step politically". Ummmm Not really. https://t.co/jiEYMugVHz

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— Marco Rubio (@marcorubio) May 17, 2016

As for future in politics, well it's nearly impossible for someone not in office to ever become a successful candidate for President.Right?

— Marco Rubio (@marcorubio) May 17, 2016

Rubio suspended his campaign on March 15 after failing to win his home state of Florida to presumptive Republican nominee Donald Trump, who had mocked his younger adversary for his Senate absences and called him “Little Marco.”

Rubio’s decision to go negative against Trump — and at one point making apointed reference to the size of the real estate magnate’s hands — dented his popularity.

His tweets have taken on a different tone than during his campaign, and have picked up in pace since he dropped out of the race.

I have only said like 10000 times I will be a private citizen in January.

— Marco Rubio (@marcorubio) May 17, 2016

This article first appeared on NBCNews.com.