Why would he show all his cards? Trump does not need to get involved in a China-India conflict. The only US interest is in keeping China off-balance. For this some support to India is good while the US gets to keep its trade ties with China intact. No overt support coming out in favor of India when things heat up. A lot of this has to do with the fact that there is no cultural/ideological affinity between the US and India. One can go back to the late 50s and early 60s to see US courting of Pakistan at the time to help keep the Soviets off balance in the region. It is essentially the same wine in a different cup. India will try to milk what it can but US isn't interested in fighting anyone else' wars.