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White House presses Iraq to block Iranian aid to Syria

 Baghdad must step up its efforts to block Iranian shipments of weapons and aid moving through Iraqi airspace to Syrian forces loyal to embattled President Bashar Assad, the White House said Wednesday. 

"We would like [Iraq] to do more" to rein in or cut off Syrian supply lines running from Tehran, a senior administration official told reporters. 

Specifically, the Obama administration is pressuring Iraqi Prime Minister Nouri al-Maliki to focus on patrolling the air routes used by Iranian forces to smuggle arms and supplies into Syria. 

Iranian supply routes, along with the growing al Qaeda threat in Iraq and Syria, is at the top of the agenda for Maliki's visit to Washington this week. 

The Iraqi delegation met with Vice President Joe BidenJoseph (Joe) Robinette BidenBiden says he would advise Trump against Mueller interview Biden on Trump's 'treason' comments: 'He's a joke' Joe Kennedy: Biden likely would have defeated Trump MORE Wednesday morning, and will meet with congressional leaders later in the day. 

The White House and Congress have repeatedly voiced their concerns over Iraq's ability to block Iranian aid shipments since the beginning of the Syrian civil war three years ago.

"We are greatly disturbed that as the international community works to bring peace to Syria, the Iraqi government is not doing everything in its power to prevent the slaughter of thousands of innocent civilians," Reps. Ted Deutch (D-Fla.) and Tom CottonThomas (Tom) Bryant CottonThis week: Trump delivers State of the Union amid immigration fight Ingraham: White House yanked immigration plan defense from show After shutdown surrender, why should progressives ever trust Chuck Schumer again? MORE (R-Ark.) wrote in a letter to Maliki in March. 

On Tuesday, Sen. John McCainJohn Sidney McCainMcConnell: 'Whoever gets to 60 wins' on immigration Meghan McCain: Melania is 'my favorite Trump, by far' Kelly says Trump not likely to extend DACA deadline MORE (R-Ariz.) along with Senate Armed Services Committee chief Carl LevinCarl Milton LevinThe Hill's 12:30 Report Congress needs bipartisanship to fully investigate Russian influence Congress: The sleeping watchdog MORE (D-Mich.), ranking member Jim InhofeJames (Jim) Mountain InhofeRepublican agenda clouded by division Overnight Regulation: Dems go on attack during EPA chief's hearing | Mnuchin promises more Russia sanctions | Regulators subpoena major bitcoin exchange | New lawsuit over FDA e-cig rule Dems go on the attack during EPA chief's hearing MORE (R-Okla.) rasied the issue again in a letter to President Obama, ahead of Maliki's visit to Washington. 

"We urge you to make clear to Prime Minister Maliki that the extent of Iran’s malign influence in the Iraqi government is a serious problem in our bilateral relationship, especially for the Congress," according to the letter. 

Senate Foreign Relations heads Sens. Robert MenendezRobert (Bob) MenendezJustice Dept intends to re-try Menendez in corruption case DACA is neither bipartisan nor in America's interest Senate DACA deal picks up GOP supporters MORE (D-NJ) and Bob CorkerRobert (Bob) Phillips CorkerPentagon: War in Afghanistan will cost billion in 2018 K.T. McFarland officially withdrawn as nominee for ambassador K.T. McFarland withdraws as nominee for ambassador MORE (R-Tenn.) also co-signed the letter. 

That said, "policing this is extremely difficult . . . [and] its really an ongoing effort" between Washington and Iraq to shut those supply lines down, the White House official said. 

During the bloodiest days of the Iraq War, U.S. and coalition forces were unable to block similar weapons and supplies shipments from Iran to insurgent groups inside the country. 

For its part, Maliki's government argues it does not have the airpower necessary to ward off the Iranian air shipments. 

To that end, Maliki told reporters in Baghdad he will press the White House to accelerate sales of F-16 warplanes and possible sales of unmanned aircraft to Iraq. 

Washington and Baghdad inked a deal in August to provide Iraq's nascent military with the American jets. 

Without those air assets, Baghdad claims its airspace will remain indefensible to Iranian supplies and support.