A Muslim Texan sought to find his place in the party at the state GOP convention. He left in tears.

To some extent, Mohamed Hussein knew he was preparing to enter the lion’s den. But he made the decision to attend the Republican Party of Texas Convention to confirm for himself that he had a place in the GOP, even as members of the party have railed for months about the urgency of ending Sharia Law and the so-called “Islamification” of Texas. What he found was a party that didn’t want him. He arrived with hope but left in tears after being told explicitly that he should leave the country. Hussein was among at least four Muslims who arrived at...