Siamak Namazi, a US citizen jailed in Tehran, announced a seven-day hunger strike, starting on Monday, as he implored US President Joe Biden to put greater priority on his case.
"All I want, sir, is one minute of your days' time for the next seven days devoted to thinking about the tribulations of the US hostages in Iran," Mr Namazi wrote in an open letter to Mr Biden.
"Only the president of the United States has the power to bring us home, should he set his mind to do so."
Mr Namazi, 41, who is of Iranian descent, was arrested in October 2015 on charges, he denies, of trying to overthrow the clerical state.
Iran also imprisoned his father, Baquer Namazi, 86, after he flew there in 2016 to try to secure his son's release. He was allowed to leave Iran in October on medical grounds.
Siamak Namazi was granted furlough at the time but then returned to Tehran's infamous Evin prison, which since has witnessed a deadly fire.
He launched his hunger strike on the anniversary of Iran's release of five imprisoned Americans in 2016, the year after Tehran entered a nuclear deal with the US and other world powers.
Former president Donald Trump, who was elected later that year, pulled the US out of the deal in 2018, but his administration managed to obtain the release of two more Americans through prisoner swaps with Iran.
"My captors enjoy taunting me about that fact by saying things like, 'How can your beloved America be so heartless? Not one but two US presidents freed others but left you behind!'" Mr Namazi wrote in his letter.
The Biden administration sought to restore the nuclear deal and made it clear it could not go forward without the release of imprisoned Americans.
But Mr Biden has acknowledged that the deal was effectively dead after protracted negotiations and as attention turned to Iran's deadly crackdown on protests triggered by the death of a woman arrested by the morality police.
"Today the whole world is witnessing how atrociously this regime can respond to those who dare demand their basic rights," Mr Namazi said.
Iran's government generally refuses to acknowledge dual citizenship and on Saturday announced the execution of a British-Iranian citizen, Ali Reza Akbari, convicted of spying for his adopted country.
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Brief scoreline:
Liverpool 2
Keita 5', Firmino 26'
Porto 0
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Date and venue Friday and Saturday, ICC Academy, Dubai Sports City
Time Matches start at 9am
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A Blighty Ducks, Darjeeling Colts, Darjeeling Social, Dubai Wombats; B Darjeeling Veterans, Kuwait Casuals, Loose Cannons, Savannah Lions; C Awali Taverners, Darjeeling, Dromedary, Darjeeling Good Eggs
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The specs: 2017 Dodge Ram 1500 Laramie Longhorn
Price, base / as tested: Dhxxx
Engine: 5.7L V8
Transmission: Eight-speed automatic
Power: 395hp @ 5,600rpm
Torque: 556Nm @ 3,950rpm
Fuel economy, combined: 12.7L / 100km
The Sand Castle
Director: Matty Brown
Stars: Nadine Labaki, Ziad Bakri, Zain Al Rafeea, Riman Al Rafeea
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The biog
First Job: Abu Dhabi Department of Petroleum in 1974
Current role: Chairperson of Al Maskari Holding since 2008
Career high: Regularly cited on Forbes list of 100 most powerful Arab Businesswomen
Achievement: Helped establish Al Maskari Medical Centre in 1969 in Abu Dhabi’s Western Region
Future plan: Will now concentrate on her charitable work
Your Guide to the Home
- Level 1 has a valet service if you choose not to park in the basement level. This level houses all the kitchenware, including covetable brand French Bull, along with a wide array of outdoor furnishings, lamps and lighting solutions, textiles like curtains, towels, cushions and bedding, and plenty of other home accessories.
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World Test Championship table
1 India 71 per cent
2 New Zealand 70 per cent
3 Australia 69.2 per cent
4 England 64.1 per cent
5 Pakistan 43.3 per cent
6 West Indies 33.3 per cent
7 South Africa 30 per cent
8 Sri Lanka 16.7 per cent
9 Bangladesh 0