A constitutional amendment is a formal change to the text of the written constitution of a nation or state.

Most constitutions require that amendments cannot be enacted unless they have passed a special procedure that is more stringent than that required of ordinary legislation. Examples of such special procedures include super-majorities in the legislature, or direct approval by the electorate in a referendum, or even a combination of two or more different special procedures. A referendum to amend the constitution may also be triggered in some jurisdictions by popular initiative.

Australia and the Republic of Ireland provide examples of constitutions requiring that all amendments are first passed by the legislature before being submitted to the people; in the case of Ireland, a simple majority of those voting at the electorate is all that is required, whereas a more complex set of criteria must be met in Australia (a majority of voters in a majority of states is also necessary). Switzerland has a similar procedure to Australia's.

Mark Reed Levin (born September 21, 1957) is a lawyer, author and the host of American syndicated radio show The Mark Levin Show. Levin served in the administration of President Ronald Reagan and was a chief of staff for Attorney General Edwin Meese. He is president of the Landmark Legal Foundation, has authored bestselling books and contributes commentary to various media outlets such as National Review Online.

Mark Reed Levin was born to a Jewish family in Philadelphia, Pennsylvania and grew up in Cheltenham Township, Montgomery County, Pennsylvania. He graduated from Cheltenham High School after three years. After high school, Levin enrolled at Temple University Ambler including summer classes and graduated in 1977 at age 19, magna cum laude and Phi Beta Kappa. He also earned a juris doctorate from Temple University Beasley School of Law in 1980.

Beginning in 1981, Levin served as advisor to several members of President Ronald Reagan's cabinet, eventually becoming Associate Director of Presidential Personnel and ultimately Chief of Staff to Attorney General Edwin Meese; Levin also served as Deputy Assistant Secretary for Elementary and Secondary Education at the U.S. Department of Education, and Deputy Solicitor of the U.S. Department of the Interior.

Derek Roland Clark (born 10 October 1933 in Bristol) is a British politician, and Member of the European Parliament for the East Midlands region. He is a member of the United Kingdom Independence Party, first elected in 2004, and subsequently re-elected in 2009.

He is a retired science teacher.