The Republican National Committee had reportedly asked the Republican Senators to rough up James Comey in the hearing today, but they didn't do anything like that. They tried to offer a bit of cover for Trump, especially as far as making the most generous possible interpretations of his reported conversations, but they were mostly both polite and even deferential - Senatorial, you might say. Either they are determined to make a serious investigation or just haven't figured out yet which way they should jump.
John McCain, though, seemed both unclear and out of touch. Some wonder if the 80 year old is all right.