The reason there was a clash between President Johnson and the Radical Republicans was that President Johnson kept vetoing measures by the Radical Republicans to help the Freedmen.
This clash was resolved by the Radical Republicans overriding the veto of the President.
Why did President Johnson and the Radical Republicans clash?
Andrew Johnson was a Southerner who took over from Abraham Lincoln when the latter was assassinated. This was made possible by Andrew Johnson being the vice president to Lincoln. When Andrew Johnson became president, he wanted the Southern States to deal with the Freedman as they pleased and so was against federal legislation to that effect.
Unfortunately, the Southern States dealt harshly with the Freedmen and the Radical Republicans in Congress were forced to step in and pass federal laws to help the Freedmen. Andrew Johnson would then veto these laws which led to both parties clashing until the Radical Republicans simply overrode Johnson's veto with a supermajority in Congress.
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