Foots, Trump said the congresspeople who didn't applaud for him are treasonous. Death is one of the possible punishments for treason. So, you're right. What Trump said was even worse than threatening to arrest people. He's threatening to charge people with a crime that could sentence them to death if they don't clap for him. He's a fascist. Hopefully, he fails.
"...the successful annihilation of organized crime's subculture in America would rock the 'legitimate' world's foundation, which would ultimately force fundamental social changes and redistributions of wealth and power in this country. Meyer Lansky's dream was to bond the two worlds together so that one could not survive without the other." - Dan E. Moldea
