The National Union of Teachers (NUT) has invited five Derbyshire MPs to visit county schools and hear the union's case against Sats tests, thisisderbyshire.co.uk has reported.
As a union, the NUT is opposed to the tests and to national league tables.
It says it would prefer assessment by teachers "which arises out of children's learning" rather than comparing tests taken in different schools.
The MPs set to visit schools are Tom Levitt (High Peak), Paul Holmes (Chesterfield), Mark Todd (South Derbyshire), Judy Mallaber (Amber Valley) and Patrick McLoughlin (West Derbyshire).
Despite being against Sats testing, the NUT has warned that secondary schools must not "bear the brunt of any new system that is put in its place".
Other unions are not convinced that plans by the NUT to boycott next year's tests would be successful.
A survey conducted by the National Confederation of Parent Teacher Associations and released to the Times Education Supplement found less than half of parents polled would support a ban.