The aid worker, Abdulrahman al-Sadhan, was detained by Saudi authorities in March 2018 and reported to be sentenced to 20 years in prison followed by a 20-year travel ban, according to an April 6 US State Department statement.
He was arrested from the Red Crescent Society office in Riyadh, where he worked.
In a tweet on Sunday, Nancy Pelosi, the highest-ranking Democrat in the chamber, said Congress would monitor his appeal hearing, which she said was on Monday, and “all human rights abuses by the regime”.
“Deeply concerned with allegations of torture in detention of aid worker Abdulrahman al-Sadhan. His sentencing continues Saudi Arabia’s assault on freedom of expression,” Pelosi tweeted.
Separately, al-Sadhan’s sister said his health was getting worse.
“We are very worried about my brother’s safety & health, deteriorating under torture in Saudi detention, while we remain completely deprived of any contact with him,” Areej al-Sadhan wrote on Twitter, Al Jazeera reported.
Observers say Saudi Crown Prince Mohammed bin Salman (MBS), the country’s de facto ruler, has sought to crush dissent in recent years, while introducing social and economic reforms meant to modernise the kingdom.
In an April statement, Geneva-based advocacy NGO MENA Rights Group said al-Sadhan was brought to trial for having run two satirical Twitter accounts and accused of “funding terrorism”, supporting or sympathising with the ISIL (ISIS) armed group, and preparing, storing and sending messages that “would prejudice public order and religious values”.
The group also said al-Sadhan’s family had learned he was subjected to severe torture in detention, including “electric shocks, beatings that caused broken bones, flogging, hanging from the feet and suspension in stress-positions, threats of murder and beheading, insults, verbal humiliation”.
Last month, Saudi authorities detained a number of senior royals, activists, intellectuals and Muslim scholars.
After former US president Donald Trump’s close relationship with Riyadh, which critics said further emboldened MBS, the administration of Joe Biden has said it is pursuing a relationship “recalibration” with the longtime ally.
That has included an announcement that the US would no longer support Saudi Arabia’s “offensive operations” in the ongoing conflict in Yemen and the sanctioning of Saudi officials, excluding MBS, after a declassified US intelligence laid the blame for the killing of journalist Jamal Kashoggi at the crown prince’s feet.