BS on Ryan's comment, The incentive and calls for violence against Trump and Republicans has been promoted by leftist politiicans and the fifth-column media. The NY play showing the portrayal of the President of the United States being assassinated was a further signal. The play's director had been planning this since the November election.
The left is pulling out all the stops. If they can't impeach Trump they will encourage psychopaths to kill him and or any other Republicans. They are willing to disrupt the system and turn the country into a police state.
If not legal responsible, the Demonicrats are morally responsible for the attempted assassination of Steve Scalise.
It sounded to me like the us in “an attack on one of us is an attack on all of us” to mean the politicians in Washington and their class, regardless of party.