So Strzok was apparently the master of fraudulent documents. He fabricates certain docs, then passes them along to RR. RR uses them and other evidence in part, for the indictment of the Russians!
At Summit, Putin had to give Potus proof of the whole thing or at least Putin corroborated all of it.
Aside from that, everyone screaming about the summit seem to have a vested interest in Russia. Either through banking/investment or corruption of govt and industries, the loudest ones criticizing are tricking the uninformed masses into believing Trump is tied to Putin!