Senate is exploring legal options to ensure the controversial Security Laws (Amendment) Bill, which was signed into law last week, is nullified, Mombasa Senator Hassan Omar has said.

In a statement, Mr Omar said the new law was illegally passed by the National Assembly because MPs did not follow the Constitution.

"The National Assembly Speaker didn't consult his Senate counterpart as required by law," said Omar.

Omar said this as he prepares for the debate about the security law when the senators hold a special session on Tuesday to discuss the manner in which the contentious law was passed and assented to by President Uhuru Kenyatta.

He said according Article 110 (3) of the Constitution requires that before either House considers a bill, the two speakers must jointly resolve any question as to whether the bill concerns counties or not.

"There is a constitutional requirement that anything touching on security matters must be deliberated by the Senate," said Omar.

He said he was optimistic the senators will deliberate the constitutionality of the law if it has contravened the Constitution. The Coalition for Reform and Democracy has already filed a case in court challenging the constitutionality of the law.

The law has already started being felt by media houses which are finding it difficult to get confirmation of high profile crimes the police do not want to comment on.