The southwest was an early hotbed of the uprising against President Bashar al-Assad and defeat there would leave rebels with just one remaining stronghold - the area around Idlib province bordering Turkey in the northwest.
A string of rebel-held locations in southern Syria passed into regime control Sunday as the government regained more ground under Russian-brokered deals, a war monitor said.
Eastern Ghouta is in that region and was taken by an assault that killed over 1,000 civilians and decimated several towns.
The entire southwest is part of a "de-escalation zone" agreed previous year by Russian Federation, the United States and Jordan.
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On Wednesday, Supreme Court Justice Anthony Kennedy announced he is retiring - allowing Trump to appoint his second justice. Heitkamp says she also talked about worldwide trade, oil prices and health care-related issues with the president.
The statement said Russian Federation and Iran were violating the agreement they made and that it was "no surprise" that they proved to be "totally untrustworthy".
Tens of thousands of people have fled toward the border with Jordan and thousands more to the frontier with the Israeli-occupied Golan Heights.
Neighbouring Jordan says it can not afford to take any more refugees and is turning away the internally displaced at the border. Another rebel official said some towns were trying to negotiate deals with the state on their own. Israel seized much of the Golan from Syria in the 1967 war and annexed the strategic plateau, a move not recognised overseas. So far, the USA has remained silent in the face of a breach, and rebels are accusing them of making a "malicious deal" to remain silent.
But rebel participation in negotiations across Daraa province has proved divisive for southwestern Syria's opposition factions, many of whom are split between negotiating a political settlement and continuing to fight.
Ibrahim Jabawi, spokesman for the Syrian opposition, said that a deal could not be reached.
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The game also has the added wrinkle of the second-placed finisher arguably having an easier route to the final, on paper at least. With six of the groups already decided, on paper, it seems one half of the draw is much harder than the other.
Russia-backed regime forces have been bombarding insurgents in southern Syria since June 19 in an effort to retake areas.
Opposition negotiators and a spokesman said a six-member civilian and military committee of the southern rebels held a preliminary meeting along the administrative borders of neighbouring Sweida province.
The Kremlin said Russian President Vladimir Putin and U.S. President Donald Trump will have a detailed discussion about Syria when they meet in July.
At least 270,000 people have fled their homes in south-western Syria since the military launched an assault on rebel-held areas two weeks ago, the United Nations says.
The war monitor says that almost 100 civilians have been killed.
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Senegal had been heading through until the 74th minute when Mina rose to meet a corner and sent a bullet header into the net. His exit did little, however, to revive the sluggish South Americans, who had been second best in nearly every department.