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Supporters of prominent Egyptian activist , who on Sunday will mark 100 days on a hunger strike, are calling on to help secure his release, a statement said.

A major figure in the 2011 revolt that toppled longtime autocrat , Abdel-Fattah was sentenced in December to five years in prison after he was convicted along with two others of "broadcasting false news".

Sunday will mark 100 days of his , a statement from his support committee said. He has been only taking "100 calories a day in the form of a spoon of honey and a drop of milk in tea", Saturday's statement said.

His sister will speak about his case in a media briefing in Washington on Monday ahead of a later in the week by US President Joe Biden, the statement added.

Other Arab leaders including are expected to be present in Saudi Arabia when Biden visits the kingdom as part of his tour.

Another sister, continues to draw attention to the plight of what rights groups say are about 60,000 political prisoners in Egypt. She has been collecting letters of support from European lawmakers for months.

Mona Seif announced this week that she was suspending her own hunger strike, which she had begun in solidarity with her brother.

"Alaa is currently serving a five-year sentence for sharing a Facebook post about prison conditions in Egypt," the support committee statement said.

"He is on hunger strike demanding his right to consular access from the British embassy," it added.

Abdel-Fattah gained in April from inside prison, through his British-born mother Laila Soueif.

Egypt's interior ministry said last month that it had footage that "disproves" reports of his hunger strike.

Foreign Secretary said in June that Britain was "working very hard to secure his release".

The British government is now in disarray after as prime minister this week.

Egypt is set to host the COP27 climate summit in November, a role Human Rights Watch has said "rewards" President Abdel Fattah al-Sisi's "repressive rule".