Protesters in Port-au-Prince yesterday burned tires and threw rocks at police, who responded with tear gas. No deaths or major injuries were reported.
It was Haiti's third anti-government protest in about a month and the first one in recent years to push through the security perimeter at the National Palace.
Some protesters carried pictures of Russian President Vladimir Putin asking him for help. They accused the US of supporting Haiti's current leaders although Washington has pushed Haiti's government to hold the elections.
The six senators have said the legislation is unconstitutional and favours the government.