"The system is rigged. General Petraeus got in trouble for far less. Very very unfair! As usual, bad judgement," Donald Trump said in a tweet.
The presumptive Republican presidential candidate Donald Trump on Tuesday described as "very very unfair," the FBI's recommendation to not to prosecute Hillary Clinton in the email gate scandal.
"The system is rigged. General Petraeus got in trouble for far less. Very very unfair! As usual, bad judgement," Mr Trump said in a tweet, a few hours after the FBI Director James Comey announced that the investigating agency has concluded its investigation into the Ms Clinton's email scandal.Mr Comey said the FBI would not recommend to the Department of Justice on charging former Secretary of State, who is now the presidential candidate of the Democratic party.
"FBI director said Crooked Hillary compromised our national security. No charges," Mr Trump said in another tweet.
The Speaker of the US House of Representatives Paul Ryan said the FBI announcement defies explanation.
"No one should be above the law. But based upon the director's own statement, it appears damage is being done to the rule of law. Declining to prosecute Secretary Clinton for recklessly mishandling and transmitting national security information will set a terrible precedent," Mr Ryan said.
"The findings of this investigation also make clear that Secretary Clinton misled the American people when she was confronted with her criminal actions. While we need more information about how the Bureau came to this recommendation, the American people will reject this troubling pattern of dishonesty and poor judgement," he said in a statement.
Senator Marco Rubio, a former Republican presidential candidate, said there is "simply no excuse" for Ms Clinton's decision to set up a home-cooked email system which left sensitive and classified national security information vulnerable to theft and exploitation by America's enemies.
"Her actions were grossly negligent, damaged national security and put lives at risk," he alleged.
The Republican National Committee (RNC) Chairman Reince Priebus said the FBI's findings are a glaring indictment of Ms Clinton's complete lack of judgement.
"We now know Clinton failed to turn over thousands of work-related records she certified were in the possession of the State Department, that more than one hundred emails contained material that was classified at the time they were sent or received, and that her server was less secure than Gmail and was likely hacked by hostile actors," he said.
"Between the Attorney General's private meeting with Bill Clinton last week, to President Obama's active support for Hillary Clinton's candidacy, the American people will rightly be left second guessing whether justice was really served," Mr Priebus said.
Meanwhile, the Clinton campaign welcomed FBI's decision. In a statement, Clinton's campaign spokesman Brian Fallon said: "We are pleased that the career officials handling this case have determined that no further action by the (Justice) Department is appropriate... We are glad that this matter is now resolved."