Washington DC - A US airman who was arrested after criticizing President Donald Trump's decision to go to war with Iran said he is willing to pay the heavy price that comes with speaking out.

Major Jason Watson was arrested in front of the US Capitol building in July after attending a news conference organized by the Removal Coalition, a group calling for Trump's impeachment, conviction, and removal from the White House.

Following the news conference, Watson had stood on the Capitol steps while holding a sign calling for Trump's removal. He was arrested for unlawful protest.

He now faces blow back from the Pentagon due to his position as an active member of the US Air Force.

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Under Article 88 of the Uniform Code of Military Justice, a military service member is not allowed to use "contemptuous words" against the president, vice president, congressional members, military leaders, or state governors.

Speaking with Erin Burnett of CNN, however, Watson doubled down on his criticism of the Trump administration.

"What is happening with President Trump is not normal, he has failed us," Watson said. "He is flagrantly violating the constitution, breaking the law, engaged in rampant corruption, and is killing Americans."

"That is unacceptable to me, and it should be unacceptable to all of us," he continued. "You do not have to be somebody special to take action and reject this government, we can all do something."

When asked by Burnett why he is speaking out despite the risk of court martial and even imprisonment, Watson said "nothing that is worth doing is something that you can do for free."

"We all have to have courage – so for me to take action, if I don't sacrifice something… then it's just words, and words are easy to ignore."