Emergency laws will be rushed through the Parliament to allow police and MI5 to investigate people's mobile phone and internet data.
The new measures will mean phone and internet companies will be required to store data for a year.
More top news
The former reality TV star will follow in the footsteps of Abraham Lincoln and John F Kennedy when he takes his oath later on Friday.
The President-elect's comments on Twitter will come under even closer scrutiny when he takes office on Friday.
Cold, quiet and calm