US Trade Representative Robert Lighthizer, who has been negotiating a trade deal with India, is not travelling with Trump on the India trip. In fact, he had cancelled his earlier trip to India as well.

“We continue to talk to our Indian colleagues about addressing these market access barriers. Our trade teams, led by the USTR, have been in touch with their counterparts over the past several weeks. That engagement will continue,” the official said.

“The trade and economic relationship with India is critically important to the United States, and I think also access to the United States market is critical to the Indian government. We do want to make sure that we get this balance right. We want to address a bunch — a lot of concerns, and we’re not quite there yet,” the official said in response to a question.
— Read on economictimes.indiatimes.com/news/economy/foreign-trade/yet-to-finalise-trade-deal-with-india-white-house/articleshow/74252714.cms

Critically important because Apple has at least one plant in India. Why won’t Lighthizer even go to India?! 🤔💭