Republican senator Rand Paul is considering trying to block a US arms sales agreement with Saudi Arabia after labeling the country an "unreliable ally" and questioning its human rights record.

Just days after the $1.15 billion agreement has been made between the two countries, Mr Paul told Foreign Policy magazine that he would work with a bipartisan coalition to stop the sale. Politicians have 30 days to block the agreement.

"Saudi Arabia is an unreliable ally with a poor human rights record. We should not rush to sell them advanced arms and promote an arms race in the Middle East," said the Kentucky senator.

Although the war in Syria has received the mainstay of international attention, Yemen is also at war. According to Unicef figures in June, more than 14 million people in the Middle East’s poorest country are facing food insecurity and the same number need basic health care.

Mr Paul and his foreign relations committee colleague, democratic senator Chris Murphy, have been vocal in their opposition to US aid in Saudi Arabia.

They co-authored a bipartisan bill in April that would have forced the president to certify that the Saudis were “taking all feasible precautions to reduce the risk of harm to civilians” in Yemen before further arms deals were brokered.

"If you talk to Yemeni Americans, they will tell you in Yemen this isn’t a Saudi bombing campaign, it’s a US bombing campaign," Mr Murphy said in June, as reported by Defense News. "Every single civilian death inside Yemen is attributable to the United States. We accept that as a consequence of our participation."

Saudi-led coalition resumes air strikes in Yemen

After peace talks in Kuwait fell apart, the situation is deteriorating in Yemen.

Fighting started again last week and more than a dozen people were killed when airstrikes hit a food facility.

Yemen's splendid isolation Show all 7 1 /7 Yemen's splendid isolation Yemen's splendid isolation A house in the Yemenismall mountain village of Kawkaban AFP/Getty Yemen's splendid isolation Proud and complex: two Yemeni youths wear traditional daggers EPA Yemen's splendid isolation Market traders among their wares Nick Redmayne Yemen's splendid isolation The Throne of Balqis, a historical site in the Mareb province AFP/Getty Yemen's splendid isolation A 1,600-couple mass wedding ceremony EPA Yemen's splendid isolation A young entrepreneur Nick Redmayne Yemen's splendid isolation Some of the country's striking architecture AP

The intervention started in March last year as Saudi Arabia wanted to restore Yemeni president Abd Rabbuh Mansur Hadi, whose government was overrun by Houthi rebels, a Shia-led movement from northern Yemen.

The UN high commissioner for human rights reported that 272 civilians have died between the nominal truce in April until the peace talks ended in August.

More than 1,100 children have died since the fighting began and more than two million people have been displaced, according to Unicef and the Associated Press.