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Since launching his campaign last February, Booker struggled to raise the type of money required to support a White House bid. He was at the back of the pack in most surveys and failed to meet the polling requirements needed to participate in Tuesday's debate. Booker also missed last month's debate and exits the race polling in low single digits in the early primary states and nationwide.

Booker had warned that the looming impeachment trial of President Donald Trump would deal a "big, big blow" to his campaign by pulling him away from Iowa in the final weeks before the Feb. 3 Iowa caucuses. He hinted at the challenges facing his campaign last week in an interview on The Associated Press' Ground Game podcast.

"If we can't raise more money in this final stretch, we won't be able to do the things that other campaigns with more money can do to show presence," he said.

The protests in Iran that followed Tehran's admission of its role in the downing of the Ukrainian passenger jet were met with an outpouring of support from Washington. But is it about Iranians, or regime change?

US officials and establishment figures certainly spared no effort as they went out of their way to show how much they supposedly admire the 'courage' of Iranians who took to the streets to vent their anger at the fact that a Ukrainian passenger jet, with many Iranians on board, was mistakenly shot down by Iran's military - something Tehran admitted of its own volition before the results of the crash investigation were made public.

However, Washington apparently decided that this tragedy, which took the lives of 176 people, is a good enough reason to remind Iranians - who are already consumed by grief - just how much they are 'suffering' at the hands of a supposedly 'oppressive' regime that, by sheer coincidence, turns out to be America's arch-rival in the region.

President Donald Trump spent the last couple of days tweeting compliments to the protesters and warnings to Tehran, both in English and in Farsi. On Sunday he demanded that Tehran "stop the killing of your great Iranian people." There are no reports of deaths during the protests over the plane downing, even though law enforcement had to deploy tear gas and water cannons against an agitated crowd on several occasions.

Earlier, the president went so far as to remind Iranians that he - who vowed just days ago to annihilate 52 targets on Iranian soil in the event of a conflict with Iran, including prominent cultural sites - has allegedly stood with them since the beginning of his presidency.

Other US officials also wasted little time before they joined the cheering chorus of the Iranian protesters' supporters. American Ambassador to the UK Woody Johnson took to social media on Sunday to express his admiration for the protesters and "call out the cruel Khamenei regime."

Pentagon Chief Mark Esper, meanwhile, hinted at how Washington really views the protests sparked by the downing of the Ukrainian jet. "You can see the Iranian people are standing up and asserting their rights, their aspirations for a better government — a different regime," he told CBS's 'Face the Nation'.

Former US National Security Advisor John Bolton - a notorious American arch-hawk and a big fan of the idea of launching a war against Iran - was much blunter in his words, openly stating that "regime change is in the air" and "the people of Iran can see it."

State Secretary - and former CIA Chief - Mike Pompeo was the first, though, to try his hand at interpreting the "voice of the Iranian people", and stopped just short of openly calling for a regime change on Saturday.

It is true that Iran is still reeling from the tragic Ukraine International Airlines Flight 752 crash. Aggrieved Iranians are hitting the streets of Tehran for the second day amid growing public outcry over the government's actions.

When it comes to America's adversaries, though, any sign of protest sparks a keen interest in Washington. The reasons for this interest, however, do not appear to be humanitarian. During previous protests in Iran, sparked by the rise in fuel costs, Pompeo urged Iranians to send him videos of the police crackdown - but only so that "champions of democracy" in Washington could impose even more sanctions against the rival nation.

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