US President Donald Trump has sacked his national security adviser John Bolton, one of the most hawkish in his administration and the most hawkish in dealing with a number of files, most notably the Iranian file.

"I told John Bolton last night that his services were no longer needed at the White House," Trump said in a tweet on Twitter. "I disagreed strongly with many of his proposals, like others in the administration."

John Bolton, Trump's third national security adviser, responded to Trump in the same way Trump announced his resignation.

Despite the difference that has surfaced between the two men in recent months, his dismissal seemed surprising, especially as he was scheduled to hold a press conference about an hour later with the Secretary of State and the Treasury.

Who is Bolton?
Bolton, who was sacked today, was Trump's national security adviser and is the most important instigator of war and regime change in Cuba, Iraq, North Korea, Venezuela, and now Iran.

In 2018, Bolton issued a stern warning to Tehran and said, "We will pursue you" if Tehran does not ease its aggression, and the Iranian Foreign Ministry has called it a "promoter of war."

Bolton praised Trump's "excellent" decision to withdraw from the nuclear deal, and experts believe he has campaigned to bomb Iran for years.

Bolton believes that Iran was behind the attacks on four oil tankers off the UAE coast a few weeks ago, and tried to persuade Trump to take a hard line, to the extent that Trump himself said last month, "I really calm John, which is amazing."

Negotiations with the Taliban
An analysis published in the Washington Post two days ago indicates the absence of US National Security Adviser John Bolton from the meeting attended by senior officials of President Donald Trump in mid-last month on Afghanistan.

John Hudson and Josh Doce say in their analysis that Bolton's absence is remarkable, especially following the significant progress in talks between US and Taliban delegations in the Qatari capital Doha.

The presence of the top national security adviser, Bolton, is crucial in such an atmosphere, but his exclusion was not a coincidence, according to senior US officials.

Bolton, who has long championed a large military presence around the world, has become a powerful domestic enemy of an emerging peace deal aimed at ending the longest US war, officials say.

Anger Trump
Bolton's opposition to the diplomatic effort in Afghanistan angered President Donald Trump and made his aides deprive the National Security Council of sensitive discussions about the deal, the officials said.

Bolton's marginalization raised questions about his influence on an administration seeking to withdraw troops from Afghanistan, an ambitious nuclear deal with North Korea and possible negotiations with Iranian President Hassan Rouhani.

The analysis suggests that officials, speaking on condition of anonymity, confirmed Bolton's marginalization at any meetings on Afghanistan became evident, especially last month when top officials gathered at the Trump resort in New Jersey to discuss a peace deal with the Taliban and Afghan officials.