The White House press secretary said former national security adviser John Bolton lost access to Twitter because he was old and forgot his password.

"Sometimes an elderly person, such as my father, does not understand that all he needs to do is contact Twitter and reset a new password if he forgets. Therefore I will stop discussing this," the secretary said. White House Stephanie Grisham gave an interview to Fox Business on November 22.

The statement was made by Grisham after former national security adviser John Bolton accused the White House of not paying access to Twitter after he resigned in September. Bolton, 71, is two years younger than President Donald Trump.

Bolton on November 22 first posted on his Twitter account after two months "silence", which said his account was "freed" after being "unfairly suppressed" since when resigned.

Bolton and other officials in the Trump administration are required to submit control of Twitter accounts, including passwords, when taking office at the White House.

Bolton said that the White House "attaches software" to his Twitter account. However, a senior official said the White House "had no technical means to do so" and did not block Bolton's Twitter account.

Information Bolton regained access to Twitter appeared at a sensitive time of the Trump administration, when the White House boss was in the storm of impeachment investigation.

Bolton is said to be one of many US officials who have warned Trump about using his own lawyer Rudy Giulian to contact and pressure Ukraine, asking Ukraine's President Volodymyr Zelensky to investigate former U.S. Vice President Joe Biden with Hunter son. Biden is Trump's biggest rival in the race to the White House.

Bolton became Trump's national security adviser in April 2018, but he resigned on September 10. After resigning, Bolton criticized Trump's policy on Iran, North Korea and Afghanistan. Trump claimed to have "fired" Bolton for repeatedly obstructing him in foreign affairs.