Whitewash.
An invitation? What did he say? Not what the megaphone guys said, what did Robishaw say that could be construed as an invitation?
Allow me to provide your neglected
context:
Officer Robishaw was attempting to quell the crowd and move them out of the area. Chansley approached Officer Robishaw and screamed, among other things, that this was their house, and that they were there to take the Capitol, and to get Congressional leaders. Chansley also used his bullhorn to communicate that they were there to take out several United States congressmen.
While Officer Robishaw was attempting to quell the crowd, Chansley was using his bullhorn to incite it. Because the Capitol building is cavernous, the sound of Chansley’s voice over the bullhorn carried to different areas of the building. Officer Robishaw could hear reactions from a different group of protestors in a different hallway—being kept back by other officers—when Chansley would yell into the bullhorn. The photograph below depicts their interaction.
Robishaw and other officers calmed the protestors somewhat and directed them to leave the area from the same way they had entered. Most protestors complied, but Chansley disobeyed the order and instead began heading up a different stairwell towards the Senate floor. Officer Robishaw, alone with more than 25 rioters in the Senate Chamber, attempted to engage with Chansley and asked for his assistance to use the bullhorn to get the protestors out of the Chamber. Instead of doing so, Chansley ran up on the dais where Vice President Pence had been presiding just minutes before, and begin posing on the dais for other rioters to document and photograph, and wrote a note to Vice President Pence saying, “it's only a matter of time, justice is coming.”