The price will surely fall off the track but does not mean that the bitcoin will die after He Banned it, remember China has Banned bitcoin too but it remains until it recovered its price again. so if Trump banned bitcoin, it will not affect much it just one of the worst decision he will make.

any kind of negative news in any kind of market out there always causes a downtrend in that market, there is no exception either. so your question is half answered, obviously bitcoin price could fall if that hypothetical situation happened.
but again like any other market the value doesn't come from random news whether positive or negative. the value always comes from the utilities and bitcoin won't change when a country bans it or when a country adopts it, bitcoin will remain the same resilient decentralized currency as it has always been. so the other half of the answer is that price would rise back up after the "drama" ended.

i think if donald trump ban bitcoin it's doesnt mater with the bitcoin prices because bitcoin holder not just from the US.

Donald Trump will face the full force of some very powerful companies in the courts, if this happens. A company like Coinbase can fund a lot of lawyers to fight this all the way to the Constitutional court and we have seen previous court cases on encryption technology that has already paved the way for them not to even attempt this. <Courts already made the ruling that you are allowed to encrypt your data> 

We also saw what happened in the US when they banned the nationwide sale and import of alcoholic beverages, called the Prohibition. People just went underground and started to do this illegally and this robbed the US of millions in tax income for years. We already know Bitcoin is unstoppable, so you can guess what will happen if they start banning Bitcoin too. 

He only says few words through an social media but it's makes crypto users around the world speculate about the future of crypto but it would be different if those tweeted came from the presidents outside US however if this is happen then i think the price suddently fall as some of people always be utilize bad news about crypto to dumped the price but i don't think it will be last long consider most of bitcoin users not only came from US

Donald Trump could ban bitcoin and other cryptocurrencies banned from USA, and the same can't be expected to happen through the rest of the countries. Even now there are more countries that have banned the usage of bitcoin, yet the usage from people keeps continuing. I believe there will be such disturbance in the market if Trump takes some initiative to ban bitcoin, other than that there won't be big impact.

According to the latest news, the US Dollar is possible nearing default. After Trump’s announcement that he didn’t like Bitcoin, the Chinese court found Bitcoin as "virtual property". From this, it can be concluded that if the US bans Bitcoin, China will become the center of cryptocurrency and gain control of the market, Bitcoin will grow by suppressing the dollar and the US will be in a very difficult position

The worst case scenario is when Bitcoin is banned in the US by Donald trump, I think immediately the price of bitcoin will fall as well as a series of other coins, but I believe it doesn't happen when The versatility of bitcoin gives the US economic and military benefits to the US president.

Yea, I honestly think the main problem would be the exchanges. Since they would no longer be able to legally run and sell Bitcoin for fiat, it would cause a lot of issues. I think that the chances of this really happening though are quite slim. Donald (just like every president) says a lot of things that will never happen, just to get the crowd going.

What does it matter what Trump will do, beside he can only try to ban in usa not in other country, Trump will come and go but btc will still remain supreme, i feel irritated anytime i see all this topic about btc and trump, too much attention on it which shouldn't be, he should focus on doing right by his citizens not on btc.