Donald Trump is the US president candidate promised will make bitcoin as legal currency transaction or get more space in United States [...]
False. The US president that made Bitcoin legal in the United States was Barack Obama. It has been legal here since Bitcoin began.
Not to mention Trump has a history of just saying things he has no intention of doing. The president doesn't even have the power to make changes to bitcoin legislation, or any kind of legislation.
Having said that, he's now a shoe-in for the presidency -- he was already winning in the polls so there's no way he'll lose.