It’s not that Trump was ill, or that he got a replacement speaker–illnesses do happen (remember when Bush 43 barfed on the Japanese prime minister?). What’s weird is that the replacement speaker was an assistant to the president instead of the Secretary of State. First of all, foreign policy is his job. Second, he’s fourth in the line of succession to the presidency–he’s arguably one of the most important, if not the most important, cabinet officials.
Instead, the president’s daughter gave the speech.
This is not normal.