US counter-intelligence investigators have discovered a suspected Russian spy was working unchartered in the American embassy in Moscow for more than 10 years

According to The Guardian, the Russian native, a woman, was hired by the US Secret Service and is believed to have had access to their intranet and email systems, giving her access to highly confidential information.

She only came under suspicion in 2016 when a routine security check discovered she was having unauthorised meetings with Russia’s principal security agency, the FSB.

The Guardian reports instead of launching an inquiry, the Secret Service quietly let her go last year in an assumed attempt to avoid controversy.

“The US Secret Service recognizes that all Foreign Service Nationals (FSN) who provide services in furtherance of our mission, administrative or otherwise, can be subjected to foreign intelligence influence,” a Secret Service statement said.

“This is of particular emphasis in Russia. As such, all foreign service nationals are managed accordingly to ensure that Secret Service and United States government interests are protected at all times. As a result, the duties are limited to translation, interpretation, cultural guidance, liaison and administrative support.

“It was specifically the duties of the FSN position in Moscow to assist our attaches and agency by engaging the Russian government, including the Russian Federal Security Service (FSB), the Russian Ministry of the Interior (MVD), and the Russian Federal Protective Service (FSO) in furtherance of Secret Service interests.

“At no time, in any US Secret Service office, have FSNs been provided or placed in a position to obtain national security information.”

It comes as US President Donald Trump directed a “vast, government-wide effort” to protect American elections after Russian attempts to interfere in 2016.

Responding to bipartisan criticism that it has no clear national strategy to protect the country during the upcoming midterms and beyond, John Bolton, the national security adviser, wrote in a letter to Senate Democrats that “President Trump has not and will not tolerate interference in America’s system of representative government.”

The warning to American adversaries came as top US intelligence and homeland security officials raised alarms about potential efforts to influence the 2018 and 2020 elections. Homeland security chief Kirstjen Nielsen said: “Our democracy is in the crosshairs.”

“We continue to see a pervasive messaging campaign by Russia to try to weaken and divide the United States,” Director of National Intelligence Dan Coats said.

Their comments during a White House briefing followed weeks after Mr Trump publicly undermined the conclusions of American intelligence agencies regarding Russian interference. After suffering a bipartisan outcry, Mr Trump later said he accepted those conclusions.

They, along with National Security Agency director Gen. Paul Nakasone and FBI Director Christopher Wray, appeared at the White House this morning to try to reassure the American people they are doing everything in their power to address the threat.

“We’re throwing everything at it,” Mr Coats said.

Ms Nielsen, Mr Wray and Mr Nakasone had all gathered earlier this week in New York City with leaders of top finance, energy and telecommunications companies for a cybersecurity summit, where they spoke of the urgent need for a collective, collaborative approach to security.

At the event, Ms Nielsen said the cyberthreat that now exceeds the danger of a physical attack against the US by a hostile foreign group.

Mr Wray told reporters that compared to 2016, in 2018, “We are not yet seeing the same kind of efforts to specifically target election infrastructure,” but that other efforts to influence public opinion continue.

On Capitol Hill, politicians in both parties have pushed election security toward the top of the coming fall agenda amid heightened concerns about interference by Russians and others ahead of the midterm elections.

Asked this week how confident he was in the integrity of election systems ahead of the fall midterms, the No. 2 Republican, Sen. John Cornyn of Texas, said, “I’m confident we’re doing the best we can.”

Beyond Russian interference with social media campaigns to influence voters, politicians are increasingly looking at how to bolster election infrastructure in the states — even though Congress shot down a recent effort to boost federal funding for local and state systems.

Both Republicans and Democrats have criticised the administration’s response as fragmented, without enough co-ordination across federal agencies. And with the midterms just three months away, critics are calling on Mr Trump to take a stronger stand on an issue critical to American democracy.

The Senate is working on a bipartisan package backed by Republican leaders that would boost federal assistance to state and local election officials with cybersecurity guidelines, data sharing and security clearances.

It’s expected in September.

Republican politicians are wary of being seen as imposing any new regulations on states that have resisted federal control.

Mr Bolton said Mr Trump is “leading unprecedented action to punish Russia” for its efforts to disrupt American elections.