The Hamas is an Islamist group that controls Gaza, the region of Palestine that recently was subject to a large scale airstrike by Israeli forces. They enjoy popular support among Palestinians, especially those residing in Gaza. Historically, the Hamas has been involved in numerous armed attacks on Israeli forces, civilians and property. As a consequence, they are designated as a terrorist group by Israel and USA, among other nations.
The US, along with its allies - in particular Egypt - has traditionally negotiated with Israel and the Palestine Liberation Organisation lead by Fateh (a Palestinian political party which governs in the West Bank region of Palestine) in order to implement the two state solution. The USA and its allies recognise the PLO as the legitimate government in Palestine. However, over the last decade, there has been a decrease in popularity of Fateh and the PLO among Palestinians, with its leader Mahmoud Abbas calling off the proposed elections for 2021 (the first elections to be held in Palestine since 2005) as he feared that the elections might lead to Hamas making considerable headway into the West Bank political scene.