Sen. Mazie Hirono Mazie Keiko HironoDemocrats unveil plan declaring racism a public health issue Overnight Defense: US, Russia trade blame over Syria incident | Pentagon calls out China's 'counterproductive' military exercises, missile test | Democrats press Esper on COVID-19 response Democrats press Esper on 'concerning' rise in Pentagon's COVID-19 cases MORE (D-Hawaii) argued Tuesday that President Trump's attacks on Sen. John McCain John Sidney McCainMomentum growing among Republicans for Supreme Court vote before Election Day McConnell urges GOP senators to 'keep your powder dry' on Supreme Court vacancy McSally says current Senate should vote on Trump nominee MORE (R-Ariz.) show the president to be "egocentric."

In an interview on CNN, the Hawaii Democrat said Trump should focus on more important issues, rather than personal attacks aimed at lawmakers.

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"It just goes to show how egocentric the president is," Hirono said. "Frankly, the way I look at it, there are a lot of problems and concerns that he should be addressing."

Hirono pointed to rising health-care premiums in her home state as an immediate concern that she claimed Trump is ignoring.

"He has said ObamaCare is dead, which means that the president owns health care in our country now, and because he has ended the subsidies, health-care costs will go up immediately," she said, referring to the administration's move last week to stop key payments to insurers.

"I know for a fact that in Hawaii, everyone in Hawaii will see their health-care costs go up by 5 to 8 percent because of the stopping of the subsidies," she continued.

"So those are the things that he should be concerned about, and I'm sorry that he's attacking a true war hero, something he doesn't seem to really understand or appreciate."

Hirono's remarks come hours after Trump threatened to "fight back" after McCain's denunciation of nationalist politics that many saw as a thinly-veiled shot at the Trump administration.

"People have to careful, because at some point I fight back," Trump told WMAL radio host Chris Plante on Tuesday. "I'm being very nice. I'm being very, very nice. But at some point I fight back, and it won't be pretty."

McCain responded to Trump's comments moments later, saying that he has "faced far greater challenges than this," according to CNN.