Hi Shou, The subject of the verb is "that". This word is a demonstrative pronoun and in turn describes the President's business connections in many countries. Donald Trump has business connections in many countries that will put U.S. national interests in jeopardy. We can separate it right between the first idea and the second. Donald Trump has business connections in many countries. That will put U.S. national interests in jeopardy. If you still want a comma, you have to use a conjunction. Donald Trump has business connections in many countries, AND that will put U.S. national interests in jeopardy. Hope this helps. Cheers, Lance

These answers assume that the word 'that' was used correctly. It's impossible to tell just from these words, though. 1. Connections. 2. You can't. If you try, then you'll break the meaning of 'that'. 3. No. A comma is advised before 'which' and not before 'that'. That's one of the ways you can tell them apart. There's a lot of confusion around these two words among speakers of English. :)

This is an inflammatory statement meant to cause a reaction. That is why the word WILL here is out of place. It leaves one confused trying to understand what education the writer has that created a libelous statement. There is no fact behind this statement. It is meant to make someone wrong.

Thanks for your valuable answer.