The French government, which supports the moderate Syrian opposition and wants Assad to leave power, was quick to clarify that the lawmakers were there in no official capacity.
But four years of bloody conflict, the repeated failure of diplomacy and the eruption of the Islamic State group have undermined France's standpoint as more and more countries consider re-engaging with Assad's regime.
"We met Bashar al-Assad for a good hour. It went very well," Jacques Myard, an MP from the conservative opposition UMP party, told AFP in a telephone interview.
Government spokesman Stephane Le Foll stressed it was "in no way an official French initiative" and the foreign ministry said earlier that the lawmakers did not carry any "official message."
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"We suspected that Bashar would roll out the red carpet, it benefits his strategy of re-legitimisation," said a diplomatic source, who wished to remain anonymous.
Myard said the trip was "a personal mission to see what is going on, to hear, listen."
A Syrian governmental source said the lawmakers were also due to meet Foreign Minister Walid Muallem today.
France severed diplomatic ties with Syria in 2012, along with Britain, Italy, Germany and Spain, as what started as a pro-democracy protest seeking Assad's ouster in March 2011 morphed into a full-blown war.
According to the Syrian Observatory for Human Rights, a Britain-based monitoring group, the conflict has left more than 200,000 people dead.