The US has said it wants United Nations peacekeepers in the south of Lebanon to investigate Hezbollah militias.
Nikki Haley, the US ambassador to the UN, made the announcement on Monday (August 7) and said she wants "significant improvements" to be made.
Hezbollah is a paramilitary organisation in Lebanon and fears are growing that a new war could break out between the group and Israeli troops.
A force of 10,500 UN interim force members (UNIFIL) is currently helping Lebanon secure borders whilst also monitoring a ceasefire, according to France 24.
There have already been clashes between Lebanon and Israel on the boundary line, which is monitored by the UN.
Antonio Guterres, the UN secretary general, has told the security council that he wants to discuss ways that UNIFIL can improve work on the "illegal presence of armed personnel, weapons or infrastructure inside its area of operations."
Haley said she agrees with Guterres and the weapons "threaten the security and stability of the region.
"UNIFIL must increase its capacity and commitment to investigating and reporting these violations."
A UN Security Council vote on the renewal of UNIFIL in Lebanon is scheduled to take place at the end of this month.
It is thought that Guterres will also discuss the matter of UNIFIL when visiting Israel and Palestine later in August.