Hilary is saying she wants Trump to not say what his own opinion or speculation is, she wants him only to repeat what his staff that are experts in their field say.

"could" is correct. The reason is because of the word "built". It shows that we are talking about an event in the past, and that the event was certain. "might" always represents uncertainty. "could" sometimes represents uncertainty, but also is the past tense of "can".

The Boy- A Short Story.

The boy sat down. He looked depressed. He wanted to play with his friends but there was no chance. He thought that he was weird and no one liked him anymore. He used to play with them until someone told the boys that this kid is a curse. Everyone believed the story of the poor boy. He tried to explain to them that what heppened was an accident, but no one believed his story. Two months ago, the boys were playing happily in the yard when the boy kicked their ball on his friend chest and he fell down immediately. Luckily, the boy was fine. But, the boy kicked the ball and broke his friend's nose. They said this time you did it on purpose, no chance to lie. The boy was extremely sad. The boys changed their playing place every time he showed up. The boy sat alone far away from the boys to watch them play<s>*</s>. The phone rang at the boy's house, it was one of his friends who believed all what happned was accidental*. The boy was very happy to hear that but the boy told him that he could not help him and gave him a plan to comeback. He appeared in the yard with a banner written on it "who of you did not make mistakes?“. I do have a strong foot and this is a gift. Everyone was reading the writing. Some of them felt sorry for the kid and looked immediately to the boy ( > how told the that the boy was a hex.< this doesn't make sense). They smiled and let the boy play* with them and made him their striker because he had a strong foot.