Officials in the administration of US President Joe Biden predict the possible fall of Bashar al-Assad's regime within days, according to a report published today.

Citing five US officials, CNN reports that there is still no official assessment of Assad's future and that his collapse is not guaranteed. A senior US official said "the emerging consensus is that it is an increasingly plausible scenario".

"Perhaps by next weekend the Assad regime will have lost all semblance of power. The only thing that would delay a rebel takeover would be a coup and good shuffling, but Assad's men have made a good job of drowning out any potential competitors,” another official said, according to CNN.

Another source said that the progress of anti-regime groups has been mainly due to regime forces avoiding involvement in the conflict.

"The question is whether the regime's forces actually stand their ground when it comes to Damascus," they said.

Meanwhile, Bashar al-Assad is making moves to cling to power, including indirect diplomatic moves toward the US and President-elect Donald Trump, Bloomberg reports, citing sources with direct knowledge of the situation.

Assad is signaling a willingness to negotiate a deal to retain control over the remaining territory held by his forces or provide safe passage into exile if necessary, according to Bloomberg.

According to the sources, a proposal Assad relayed to Washington through the United Arab Emirates included severing Syria's ties with Iran-backed militant groups, including Hezbollah, in exchange for Western powers using their influence to stop the fighting.

In a separate effort, Assad reportedly sent a senior Christian leader to meet with Hungarian Prime Minister Viktor Orban, citing an alleged threat to Syria's Christian minority, asking the prime minister to convey these concerns the next US administration.

Fresh fighting between regime forces and anti-regime groups broke out on November 27 in rural areas west of Aleppo. By November 30, opposition forces had taken control of most of central Aleppo and established dominance across Idlib province.

After intense clashes on Thursday, the groups took control of Hama city center from regime forces. Anti-regime groups also captured several settlements in the strategically important Homs province, which leads to Damascus, and began to advance.

On Friday, Syrian opposition groups took control of Daraa in southern Syria, near the Jordanian border. Earlier on Saturday, they took full control of Suwayda province in southern Syria. On the same day, local opposition forces in Quneitra gained control of the provincial capital.