He also said it went against promises that FBI Director Christopher Wray made in the past about adhering to proper processes on personnel matters.
The FBI had been reviewing Strzok's employment over text messages he sent slamming President Trump and telling his bureau paramour "We'll stop" him from getting elected.
"No he won't", Mr Strzok replied. "The deputy director, as the senior career Federal Bureau of Investigation official, has the delegated authority to review and modify any disciplinary findings.as deemed necessary", the statement said.
During a recent monologue, Todd Starnes was glad Strzok was finally fired, but wondered why it took so long to happen.
The president also tweeted that the Clinton investigation "was a total fraud on the American public and should be properly redone!"
"This decision should be deeply troubling to all Americans", the letter continued.
All funds raised on this GoFundMe will be put into a trust dedicated to covering Pete's hefty - and growing - legal costs and his lost income.
He called the decision to fire Strzok as "taken in response to political pressure and to punish Special Agent Strzok for political speech protected by the First Amendment, not on a fair and independent examination of the facts". An internal Justice Department report issued in June blamed Strzok and Page for creating an appearance of impropriety through their texts but found the outcome of the Clinton investigation was not marred by bias.
"They overruled the FBI's own disciplinary office and fired Agent Strzok anyways".
Strzok played an instrumental role in the investigation into Hillary Clinton's private email server and helped oversee the Russian Federation collusion investigation. Manafort's attorneys are expected to notify the court Tuesday whether they intend to offer a defense or move the case directly to final arguments.
Strzok played a lead role in the investigation into Hillary Clinton's private email server and was involved in the FBI's recommendation that no criminal charges be filed against the former secretary of state.
Jordan, a member of the House Judiciary Committee, said he has never seen the top officials who ran both investigations be removed from their job post.
The texts were criticised by the Justice Department's inspector general in a recent report that examined the FBI's handling of the Clinton email probe.
Mr Strzok, in testimony before Congress last month, said that his comments about Mr Trump in messages to Ms Page were a reaction to the Republican candidate's "horrible, disgusting behaviour" on the campaign trail.