The president’s eldest son is angry about the Democratic ‘witch hunt’ against his father, so he and his girlfriend dressed up on Halloween as one.

In images posted on Instagram, Kimberly Guilfoyle provided the ‘witch’, dressing in a witch’s costume that included a hat.

Donald Trump Jr, meanwhile, wore military style camouflage hunting gear and carried a bow.

The location where the photo was taken is labeled as ‘The Swamp’ - the derogatory term that President Trump uses to describe Washington, DC.

Kimberly Guilfoyle (left) and Donald Trump Jr (right) dressed up as a 'witch hunt' for Halloween

Guilfoyle dressed up as a witch, while Don Jr wrote a full-body camo hunting suit

In the caption, Don Jr said the location the picture was shot was 'The Swamp' - a reference to Washington, DC. He writes: 'With all the bulls**t the Democrats are throwing out there we just couldn't resist.'

‘Witch Hunt!!!’ Don Jr wrote in the caption.

‘With all the bulls**t the Democrats are throwing out there, we just couldn’t resist,’ Don Jr writes.

The caption includes hashtags ‘#witchhunt,’ ‘#halloween,’ ‘#halloweencostume,’ and ‘#trickortreat.’

Don Jr, 41, and Guilfoyle, 50, a former Fox News host, began dating last year.

Trump had recently separated from his wife of 12 years and the mother of his five children at the time, Vanessa.

The twice-married Guilfoyle was previously a prosecutor in Los Angeles and later San Francisco prior to her Fox News days, and spent eight years working in the district attorney's office in both cities.

She married first husband Gavin Newsom in 2001, just two years before the prominent Democrat was elected as mayor of San Francisco.

Newsom is currently the governor of California.

'Witch hunt' is the term frequently used by President Trump to describe both the Mueller probe as well as the current impeachment inquiry conducted by Democrats in the House of Representatives.

Robert Mueller was appointed special counsel to investigate alleged Russian meddling in the 2016 elections.

After a two-year probe, Mueller issued a report in which he wrote that there was insufficient evidence to conclude that Trump or anyone in his campaign conspired with Russia to defeat Hillary Clinton in 2016.

Trump has also denounced the impeachment inquiry that has gained momentum in the House as a 'witch hunt.'

Speaker Nancy Pelosi gavels the vote on the impeachment resolution to a close

Earlier on Thursday, a deeply divided House of Representatives took a major step in the effort to impeach the President when lawmakers approved rules for the next, more public, stage in the Democratic-led inquiry into Trump's attempt to have Ukraine investigate a domestic political rival.

In the first formal test of support for the impeachment investigation, the Democratic-controlled House voted almost entirely along party lines - 232 to 196 - to move the probe forward in Congress.

The vote allows for public impeachment hearings in Congress, which are expected in the coming weeks, portending a bitter battle ahead as the United States heads into a presidential election year.

Democrats who accuse Trump of abusing his office and jeopardizing national security for personal political gain were almost unanimous in approving Thursday's measure, but they did not pick up a single Republican vote.

‘It's a sad day. No one comes to Congress to impeach a president,’ House Speaker Nancy Pelosi said before the vote.

Televised public hearings featuring US officials testifying in Congress about alleged wrongdoing by Trump could crowd out other issues like the economy and immigration as voters turn their minds to the November 2020 election.

That might damage Trump, but some of his supporters say the impeachment drive could actually boost his re-election chances by showing him at loggerheads with Washington-based political foes.

Republicans accused Democrats of using impeachment to overturn the results of his 2016 election victory.

President Trump spent the morning before the House votes on an impeachment resolution into him tweeting and retweeting words from his supporters

Trump told a UK radio station the Democrats knew they were losing next year's vote and so were trying to take him down.

‘The Democrats are desperate, they're desperate. They have nothing,’ Trump told LBC Radio in an interview.

White House spokeswoman Stephanie Grisham denounced the process as ‘unfair, unconstitutional and fundamentally un-American.’

A number of opinion polls ahead of next year's election show several leading Democratic presidential candidates leading Trump.

The probe focuses on a July 25 telephone call in which the US president asked his Ukrainian counterpart, Volodymr Zelenskiy, to investigate Trump's Democratic political rival Joe Biden, a former US vice president, and his son Hunter, who had served as a director for Ukrainian energy company Burisma.

Biden is a leading candidate in the Democratic presidential nomination race to face Trump in 2020. He and his son deny any wrongdoing.

Trump has also denied wrongdoing. Republicans have largely stuck by him, blasting the impeachment push as a partisan exercise that has given them little input.

Thursday's vote showed that Democrats have enough backing in the House to later bring formal charges, known as articles of impeachment, if they feel they have enough evidence.