Why did the u. s. senate, known as the "irreconcilables," refuse to approve the versailles peace treaty?

The group known as the irreconcilables consisted of several Republicans and Democrats in Congress, with the leader of this group being Henry Cabot Lodge. This group was strongly against passing the Treaty of Versailles because this treaty would allow the newly formed League of Nations to make war without the approval of the US Congress. Essentially, if the US joined the League of Nations, Congress no longer had the power to declare war. This scared several US Congressmen, as they felt the US would be dragged into overseas wars that they had no business getting involved in.