If he does this, it will be a good thing, even if does so for the basesest of reasons, because whistle-blowing like Snowden's is essential to preserving democracy:
Donald Trump said on Saturday that he would look at the issue of giving a pardon to whistleblower Edward Snowden.If Trump does this, it will almost certainly be because he wants to send another "F%$# You" Barack Obama's way, but it is still the right thing, even if it is motivated by such petty motivations.
Snowden disclosed highly classified information from the National Security Agency in 2013. He revealed the news covertly to the Guardian after he fled to Hong Kong, before flying to Moscow to avoid extradition back to America. He currently lives in Russia.
At a press conference on Saturday Trump said he did not know much about the case and heard powerful arguments for and against a pardon. He then added that he would look into the matter.
In 2016 a petition was started urging Barack Obama to pardon Snowden. The Pardon Snowden petition reached a million signatures in 2017 and was delivered to the White House.