Romaniainfo-icon's president sparked fresh political turmoil on Tuesday after rejecting a proposal by the election-winning leftist party to name the EU country's first female and first Musliminfo-icon prime minister.

Klaus Iohannis gave no reasons for his rejection of Sevil Shhaideh, put forward by the Social Democrats (PSD), but there was speculation that it may be due to her Syrian husband's background.

"I have properly analysed the arguments for and against and I have decided not to accept this proposal," the president told reporters in a televised statement.

"I call on the PSD coalition to make another proposal," Iohannis said.

The PSD had suggested the previously little-known Shhaideh, 52, after its thumping poll victory on December 11 when it won 45% of the vote.

The leader of the PSD, Liviu Dragnea, had withdrawn his own bid to become prime minister because he is serving a two-year suspended sentence for fraud in a previous election.

Shhaideh's political experience is limited, having served as development minister for just five months before the previous PSD-led government resigned in late 2015.

This and her personal closeness to Dragnea -- he was a witness at her wedding -- have stoked opposition accusations that she would merely be his puppet.

Shhaideh is from Romania's small and long-established Turkish minority, but her Muslim faith is not thought to have been a problem for Iohannis.

Instead the focus may have been on her Syrian husband, whom she married in 2011.

According to non-profit investigative journalism group, the Rise Project, he has several times expressed his support for Syrian President Bashar al-Assad and for Lebanese Shiainfo-icon movement Hezbollahinfo-icon.

The 54-year-old worked in the Syrian agriculture ministry for 20 years before emigrating in 2011, according to mediainfo-icon reports and Dragnea. He then served as an advisor to the Romanian agriculture ministry and gained citizenship in 2015.

Former Romanian justice minister Catalin Predoiu, from the centre-right National Liberal Party, said on Facebookinfo-icon that he "can't see how" the PSD candidate could get the necessary security clearance needed to be prime minister.

Being premier would "give her access to defence information classified as secret, including from Nato," the Western military alliance that Romania has belonged to since 2004, Predoiu wrote.

"In the absence of any explanations by the president, I suppose that his rejection is linked to questions of national security and because the United Statesinfo-icon would not have been very keen," political analyst Andrei Taranu told AFP.

Website HotNews cited unnamed sources as saying that the security services had "strongly cautioned" against Shhaideh's nomination because of the closeness to the Assad regime of her husband and his two brothers.