House Democrats will reportedly receive a briefing on Tuesday from former CIA Director John Brennan John Owen BrennanJournalism or partisanship? The media's mistakes of 2016 continue in 2020 Comey on Clinton tweet: 'I regret only being involved in the 2016 election' Ex-CIA Director Brennan questioned for 8 hours in Durham review of Russia probe MORE on Iran as tensions between the Middle Eastern country and the U.S. escalate.

Brennan, who has been critical of President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE, will speak to Democrats during a private caucus meeting, the Associated Press reported Sunday, citing a Democratic aide and another source familiar with the matter.

Wendy Sherman, who previously worked for the State Department and helped negotiate the Iran nuclear deal, was also invited to speak, according to the AP. Members of Congress will also attend a closed-door Trump administration briefing on Tuesday.

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There has been hostility between the U.S. and Iran since President Trump last year pulled the U.S. out of the nuclear deal, which lifted some sanctions on Iran in exchange for limits on its nuclear program. In recent weeks, these tensions have ramped up.

Last week, Trump denied a report that his team was getting ready to deploy 120,000 troops to the Middle East but said he would send more if it were necessary. He also said he did not want war with Iran.

The president was also frustrated with advisers such as national security adviser Bolton and Secretary of State Mike Pompeo Michael (Mike) Richard PompeoTreasury sanctions individuals, groups tied to Russian malign influence activities Navalny released from hospital after suspected poisoning Overnight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers MORE over their hardline stances on Iran and wanted to speak leaders in Tehran himself, according to The Washington Post. Meanwhile, an Iranian military official said last week that the U.S. was "holding a gun" at Tehran while calling for talks.

The State Department last Wednesday moved to evacuate non-emergency personnel from the neighboring country of Iraq.