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We propose to observe the first gamma-ray emitting z and amp amp amp gt 3 BL Lac object 4FGL J1219.0+3653 (z=3.59) for 50 ksec with EPIC-PN CCD on XMM-Newton. It is the only spectroscopically confirmed BL Lac source beyond z=3. However this source has no previous X-ray spectral measurements. The XMM observations will allow us to characterize the X-ray spectral behavior of the source which will enables us to accurately determine the associated jet power and the particle population responsible for the observed emission. We will compare the derived results with other gamma-ray emitting z and amp amp amp gt 3 flat spectrum radio quasars. [truncated! Please see actual data for full text]