Rani Jackson, one of 14 Republican lawmakers who have called for a comprehensive health test of the US president, also said that if Biden does not resign, he will be included in the 25th US law, which confirms Biden's incompetence.
Twenty-fifth US law is used when the president dies, resigns or his incompetence is confirmed.
"Biden is facing a serious problem and his condition will get worse," he said on a television program. This is no longer a disgrace. He is confused and seems lost. He can seldom say a continuous and complete sentence. Biden must conduct a comprehensive experiment and publish the results.
Criticizing the hypocrisy of Trump critics who asked him to have a health test, he said they were now silent.
Earlier this month, Jackson described Biden's behavior as disturbing, noting his forgetfulness and confusing responses. The lawmaker noted that Biden's blunders, which have become a feature of his personality, are not a sign of mental decline but of the US president's unusual behavior.
The Republican MP's remarks come a day after Biden, who has a stuttering tongue, stuttered several times during a press conference at Ohio City Hall and could barely answer questions.
In recent months, critics of the president have pointed to several cases of distraction, such as forgetting the Secretary of Defense's name while answering questions, long silence, and his bizarre behavior at a White House news conference.
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