For an abuser of power and rapist like Trump, your whole life is a cover-up.
Now, Republicans only concern is protecting Trump from consequences...
If it was Americans or Iranians they would just have bombed the ship and killed some of the crew.
As for the argument that the US will lose credibility internationally if it is seen to lose to Iran, well it lost any credibility long ago by electing someone like Trump, and then letting him ruin the country and commit all sorts of crimes at home and abroad totally unchecked.
1/ Maybe we should stop making fun of Trump trying to stop the Iran war, saying he is losing to Iran etc, though it is true. You don't want to motivate him to continue or escalate it to look tough. The only ones really benefiting from the US continuing to fight Iran longer are Putin, Xi and Bibi.
3/ falsely and pull out of Iran. That is a better outcome than the US continuing even longer in its special military operation.