Avoid citing to Twitter unless it is necessary. When citing a tweet give the author’s name, followed by the Twitter handle in round brackets, the first sentence of the tweet in double quotation marks and the full URL for the tweet. Do not give a time stamp as this will differ across jurisdictions.
Eg Donald J Trump (@realDonaldTrump) “We need a 21st century MERIT-BASED immigration system” <https://twitter.com/realDonaldTrump/status/960907362109452288>.