Good! Then President Trump can use the signing ceremony to catalog the demonicRAT roots of The KKK and white supremacist groups. As well as the fact that only demonicRATS owned slaves. And the fact that demonicRATS either largely opposed or unanimously opposed Constitutional Amendments granting blacks civil rights.
Looking at the Constitution, it appears that Resolutions are not “Bills” that become law, but any Resolutions that come to a vote before Congress are submitted to the President for signature, and if he refuses to sign the Resolution, it appears to be the same as a veto that can be overriden by Congress in the same manner. Based on that construction, it appears the President does not have the authority to amend or change the text of the Resolution in the same way that he cannot do so to a Bill.
He can make a signing statement in conjunction with signing the Resolution, and condemn all hate groups, which does not mean all groups on the SLPC hit list. If he wants to name names, fine. (Antifa, BLM, SLPC) I’m all for it.